The best way to develop system health check screen, we can use server sent events API. 

System Health Check using Server Sent Events API

You would have seen a lot of blogs for paypal php integration with REST api which is driven completely in the backend. For checkout, paypal provides an easy way to checkout for client side ready-to-use smart button payment. This approach will work only from the frontend, which will not be safe and difficult to reconcile as the backend does not have any information about it. Server side integration with the paypal smart button will help us to reconcile or track the payments even after some issues in the users payment journey. In this blog, we have walkthrough the paypal smart button with server side php laravel integration.

Laravel Paypal Integration - Smart button with server-side integration

Next.js is one of the easy-to-learn frameworks for server-side pre-render pages for client-side web applications. In this blog, we will see how we can fetch data from API and make it pre-render pages. Also, let's see how forms work in Next.js and collect the data without maintaining the database.

Data Fetching and Form Building using NextJS

Most of the cloud services provide API to fetch their data. But data will be given as paginated results as returning the complete data will overshoot the response payload. To discover the complete list of books or e-courses or cloud machine details, we need to call the API page-wise till the end. In this scenario, we can use Spring Batch to get the data page by page and dump it into a file.

Data dumping through REST API using Spring Batch

One of the popular web framework for building Single page application (SPA) or static site is React library. Application built with React packages will be rendered completely on the client side browser. If you want to reduce the load on client side browser, we need to pre-render the pages in server (Serer side rendering) and serve it to the client. So the client loads the page like simple html page. Also if the pages are rendered from server then search engine will be able to fetch and extract the pages. To do SSR for React, the best abstraction framework is Next.js. In this blog, we will explain how to build a simple consulting website using NextJS.

Build Consulting Website using Next.js

In this blog, we will bring the essential features zoom control, download, fullscreen to enhance the view experience of the media items. Lightbox components provide options for captioning the media items as well. Brought all the features only with material design and there are no dependencies required for the functionalities of the media lightbox.

React Media LightBox - Part 2

Educate and Empower software professionals in open source tools and technologies.

IvorySQL is advanced, fully featured, open source Oracle compatible PostgreSQL. IvorySQL adds a &ldquo;compatible_db&rdquo; toggle switch to switch between Oracle and PostgreSQL compatibility modes. One of the highlights of IvorySQL is PL/iSQL procedural language that supports oracle&rsquo;s PL/SQL syntax and Oracle style Packages.
IvorySQL provides the following features based on PostgreSQL:
<ul>
<li>
Oracle compatible Packages
</li>
<li>
Oracle compatible PL/iSQL procedural language
</li>
<li>
GUC to switch between Oracle and PostgreSQL modes
</li>
<li>
Oracle compatible syntax for various DDL operations
</li>
<li>
Oracle compatible date/time functions
</li>
<li>
Built-in <a href="https://github.com/orafce/orafce" target="_blank" rel="noopener">Orafce</a>
</li>
</ul>

IvorySQL is advanced, fully featured, open source Oracle compatible PostgreSQL. One of the highlights of IvorySQL is PL/iSQL procedural language that supports oracle’s PL/SQL syntax and Oracle style Packages.

IvorySQL - Oracle compatible PostgreSQL

Kubescape is an open-source Kubernetes security platform. It includes risk analysis, security compliance, and misconfiguration scanning. Targeted at the DevSecOps practitioner or platform engineer, it offers an easy-to-use CLI interface, flexible output formats, and automated scanning capabilities. It saves Kubernetes users and admins precious time, effort, and resources.
Kubescape scans clusters, YAML files, and Helm charts. It detects misconfigurations according to multiple frameworks (including&nbsp;<a href="https://www.armosec.io/blog/kubernetes-hardening-guidance-summary-by-armo/?utm_source=github&amp;utm_medium=repository" target="_blank" rel="noopener">NSA-CISA</a>,&nbsp;<a href="https://www.microsoft.com/security/blog/2021/03/23/secure-containerized-environments-with-updated-threat-matrix-for-kubernetes/" target="_blank" rel="noopener">MITRE ATT&amp;CK </a>and the&nbsp;<a href="https://www.armosec.io/blog/cis-kubernetes-benchmark-framework-scanning-tools-comparison/?utm_source=github&amp;utm_medium=repository" target="_blank" rel="noopener">CIS Benchmark</a>).
Kubescape uses&nbsp;<a href="https://github.com/open-policy-agent/opa" target="_blank" rel="noopener">Open Policy Agent</a>&nbsp;to verify Kubernetes objects against&nbsp;<a href="https://github.com/kubescape/regolibrary" target="_blank" rel="noopener">a library of posture controls</a>. By default, the results are printed in a console but they can be exported to JSON and PDF.
Kubescape is running the following tests according to what is defined by Kubernetes Hardening Guidance by NSA and CISA.
<ul>
<li>Non-root containers</li>
<li>Immutable container filesystem</li>
<li>Privileged containers</li>
<li>hostPID, hostIPC privileges</li>
<li>hostNetwork access</li>
<li>allowedHostPaths field</li>
<li>Protecting pod service account tokens</li>
<li>Resource policies</li>
<li>Control plane hardening</li>
<li>Exposed dashboard</li>
<li>Allow privilege escalation</li>
<li>Applications credentials in configuration files</li>
<li>Cluster-admin binding</li>
<li>Exec into container</li>
<li>Dangerous capabilities</li>
<li>Insecure capabilities</li>
<li>Linux hardening</li>
</ul>

An open-source Kubernetes security platform for your IDE, CI/CD pipelines, and clusters.



Kubescape - An open-source Kubernetes security platform for your IDE, CI/CD pipelines, and clusters

<div class="mt-2 h4">Alf.io is a free and open source event attendance management system, developed for event organizers who care about privacy, security and fair pricing policy for their customers. It features an ecosystem of tools to cover the lifecycle of an event from ticket distribution, to event management, to reporting.</div>
<div class="mt-2 h4">&nbsp;</div>
<div class="mt-2 h4">The GUI is currently available in Italian, English, Spanish, German, Dutch, French, Turkish, Romanian and Portuguese. It supports <a href="https://stripe.com/" target="_blank" rel="noopener">Stripe</a> and <a href="https://mollie.com" target="_blank" rel="noopener">Mollie</a> as gateways for payments done by credit card.</div>

Alf.io is a free and open source event attendance management system, developed for event organizers who care about privacy, security and fair pricing policy for their customers.

Alf.io - The open source ticket reservation system

HTMLy is an open source Databaseless Blogging Platform or Flat-File Blog prioritizes simplicity and speed written in PHP. HTMLy can be referred to as Flat-File CMS either since it will also manage your content. HTMLy uses a unique algorithm to find or list any content based on date, type, category, tag, or author, and it's performance remain fast even if we have ten thousand of blog posts and hundreds of tags.
As a flat-file CMS, With 512MB of RAM or even less, it should can handle more than 20K posts without any issues.
Features:
<ul dir="auto">
<li>Admin Panel</li>
<li>Markdown editor with live preview and image upload</li>
<li>Categorization with category and tags (multiple tagging support)</li>
<li>Static Pages (e.g. Contact Page, About Page)</li>
<li>Meta canonical, description, and rich snippets for SEO</li>
<li>Pagination</li>
<li>Author Page</li>
<li>Multi author support</li>
<li>Social Links</li>
<li>Disqus Comments (optional)</li>
<li>Facebook Comments (optional)</li>
<li>Google Analytics</li>
<li>Built-in Search</li>
<li>Related Posts</li>
<li>Per Post Navigation (previous and next post)</li>
<li>Body class for easy theming</li>
<li>Breadcrumb</li>
<li>Archive page (by year, year-month, or year-month-day)</li>
<li>JSON API</li>
<li>OPML</li>
<li>RSS Feed</li>
<li>RSS 2.0 Importer (basic)</li>
<li>Sitemap.xml</li>
<li>Archive and Tag Cloud Widget</li>
<li>SEO Friendly URLs</li>
<li>Teaser thumbnail for images and Youtube videos</li>
<li>Responsive Design</li>
<li>User Roles</li>
<li>Online Backup</li>
<li>File Caching</li>
<li>Online Update</li>
<li>Post Draft</li>
<li>i18n</li>
<li>Menu builder</li>
</ul>

HTMLy is an open source Databaseless Blogging Platform or Flat-File Blog prioritizes simplicity and speed written in PHP. HTMLy can be referred to as Flat-File CMS either since it will also manage your content.

HTMLy  - Simple and fast databaseless PHP blogging platform, and Flat-File CMS 

Kaskada is a unified event processing engine that provides all the power of stateful stream processing in a high-level, declarative query language designed specifically for reasoning about events in bulk and in real time.
Kaskada's query language builds on the best features of SQL to provide a more expressive way to compute over events. Queries are simple and declarative. Unlike SQL, they are also concise, composable, and designed for processing events. By focusing on the event-processing use case, Kaskada's query language makes it easier to reason about when things happen, state at specific points in time, and how results change over time.
Kaskada can be best used for Machine learning, Analytics, Monitoring, Reactive applications.
Features
<ul dir="auto">
<li>Stateful aggregations: Aggregate events to produce a continuous timeline whose value can be observed at arbitrary points in time.</li>
<li>Automatic joins: Every expression is associated with an &ldquo;entity&rdquo;, allowing tables and expressions to be automatically joined. Entities eliminate redundant boilerplate code.</li>
<li>Event-based windowing: Collect events as you move through time, and aggregate them with respect to other events. Ordered aggregation makes it easy to describe temporal interactions.</li>
<li>Pipelined operations: Pipe syntax allows multiple operations to be chained together. Write your operations in the same order you think about them. It's timelines all the way down, making it easy to aggregate the results of aggregations.</li>
<li>Row generators: Pivot from events to time-series. Unlike grouped aggregates, generators produce rows even when there's no input, allowing you to react when something doesn't happen.</li>
<li>Continuous expressions: Observe the value of aggregations at arbitrary points in time. Timelines are either &ldquo;discrete&rdquo; (instantaneous values or events) or &ldquo;continuous&rdquo; (values produced by a stateful aggregations). Continuous timelines let you combine aggregates computed from different event sources.</li>
<li>Native time travel: Shift values forward (but not backward) in time, allowing you to combine different temporal contexts without the risk of temporal leakage. Shifted values make it easy to compare a value &ldquo;now&rdquo; to a value from the past.</li>
<li>Simple, composable syntax: It is functions all the way down. No global state, no dependencies to manage, and no spooky action at a distance. Quickly understand what a query is doing, and painlessly refactor to make it DRY.</li>
</ul>

Kaskada is a unified event processing engine that provides all the power of stateful stream processing in a high-level, declarative query language designed specifically for reasoning about events in bulk and in real time.

Kaskada - Modern, open-source event-processing

Bigcapital is a smart and open-source accounting and inventory software, Bigcapital keeps all business finances in right place and automates accounting processes to give the business powerful and intelligent financial statements and reports to help in making decisions.
<ul>
<li>Manage your recurring invoices</li>
<li>Track all business expenses from employee payroll to office renting and categorize them into accounts and bill them to your customers</li>
<li>Track customers/vendors payments</li>
<li>Generate financial reports as and when needed. No need to wait end of month</li>
<li>Track inventory items</li>
<li>Manage users and Role based permissions</li>
<li>Multi currency support</li>
</ul>

Simple, smart online accounting software for small and medium businesses.

Bigcapital - Simple, smart online accounting software for small and medium businesses

A simple caching module that has&nbsp;<code>set</code>,&nbsp;<code>get</code>&nbsp;and&nbsp;<code>delete</code>&nbsp;methods and works a little bit like memcached. Keys can have a timeout (<code>ttl</code>) after which they expire and are deleted from the cache. All keys are stored in a single object so the practical limit is at around 1m keys.
<pre class="language-javascript"><code>const NodeCache = require( "node-cache" );
const myCache = new NodeCache();

const empObj = { id:"001", name: "xyz" };

myCache.set(empObj.id, empObj);</code></pre>

A simple caching module that has set, get and delete methods and works a little bit like memcached. Keys can have a timeout (ttl) after which they expire and are deleted from the cache. All keys are stored in a single object so the practical limit is at around 1m keys.

Node Cache - A node internal (in-memory) caching module

The WiX Toolset lets developers create installers for Windows Installer, the Windows installation engine.
The core of WiX is a set of build tools that build Windows Installer packages using the same build concepts as the rest of your product: source code is compiled and then linked to create executables; in this case .exe setup bundles, .msi installation packages, .msm merge modules, and .msp patches. The WiX command-line build tools work with any automated build system. Also, MSBuild is supported from the command line, Visual Studio, and common CI/CD build systems like GitHub Actions.
WiX includes several extensions that offer functionality beyond that of Windows Installer. For example, WiX can install IIS web sites, create SQL Server databases, and register exceptions in the Windows Firewall, among others.
With Burn, the WiX bootstrapper, you can create setup bundles that install prerequisites like the .NET Framework and other runtimes along with your own product. Burn lets you download packages or combine them into a single downloadable .exe.
The WiX SDK includes managed and native libraries that make it easier to write code that works with Windows Installer, including custom actions in both C# and C++.

The Windows Installer XML (WiX) is a toolset that builds Windows installation packages from XML source code. The toolset supports a command line environment that developers may integrate into their build processes to build MSI and MSM setup packages.

WiX Toolset - Toolset to create Windows Installer

Weaviate is an open-source vector database. It allows you to store data objects and vector embeddings from your favorite ML-models, and scale seamlessly into billions of data objects.
Weaviate offers Semantic Search, Question-Answer Extraction, Classification, Customizable Models (PyTorch/TensorFlow/Keras), etc. Built from scratch in Go, Weaviate stores both objects and vectors, allowing for combining vector search with structured filtering and the fault tolerance of a cloud-native database. It is all accessible through GraphQL, REST, and various client-side programming languages.
Weaviate provides out-of-the-box modules for NLP / semantic search, automatic classification, and image similarity search. It has a modular setup that allows you to use your ML models inside Weaviate. You can also use out-of-the-box ML models (e.g., SBERT, ResNet, fasttext, etc.). It typically performs nearest neighbor (NN) searches of millions of objects in considerably less than 100ms.&nbsp;
Weaviate allows for efficient, combined vector and scalar searches. For example, "articles related to the COVID-19 pandemic published within the past 7 days." Weaviate stores both objects and vectors and ensures the retrieval of both is always efficient. There is no need for a third-party object storage. Within Weaviate, all individual data objects are based on a class property structure where a vector represents each data object. You can connect data objects (like in a traditional graph) and search for data objects in the vector space.

Weaviate is an open-source vector database. It allows you to store data objects and vector embeddings from your favorite ML-models, and scale seamlessly into billions of data objects.

Weaviate - Vector database that is robust, scalable, cloud-native, and fast



Uber, a taxi aggregation platform operates around the globe. It was started as monolith application and later re-architected as bunch of microservices, which gives them scalability. Uber uses lot of open source tools and they have contributed quite a lot projects back to the community. This article is about analyzing Uber's open source technology stack.

Uber's open source technology stack

Stackoverflow is one of most widely used Q&A platform. It is the default choice of developers. It has over 100 million page views in a month and its Google page rank is 60. Check out its open source technology stack, the tools used to build such a popular website. Stackoverflow uses open source projects and also contributes to it.

Stackoverflow Open Source Technology Stack

WhatsApp is a most widely used cross-platform mobile messaging app for iPhone, BlackBerry, Android, Windows Phone and Nokia. Users can send text, images videos, audio for free. It almost replaced SMS. It changed the way people interact with each other. Lets check out the technology behind WhatsApp

Open Source Technology Stack used in WhatsApp

OpenJDK is the open source implementation of Java Standard Edition. Oracle (Sun) JDK implementation is going to be based on OpenJDK. OpenJDK and Oracle JDK are almost similar. There are ready made binaries available for Linux distribution but you may need to build OpenJDK on windows.

Free and Open source tools to build OpenJDK in Windows

opentaps Open Source ERP + CRM, is a fully integrated application suite that supports eCommerce, Customer Relationship Management, Warehouse and Inventory Management, Supply Chain Management, and Financial Management to Business Intelligence and mobility integration out-of-the-box. This article discusses about the open source software used to build Opentaps ERP.

Open Source Technology Stack used in Opentaps ERP

Zimbra is a Enterprise messaging and collaboration software. It is a good alternative to Microsoft Exchange server. Zimbra is a Email Server but they have not written anything related to SMTP server, rather they have integrated well know open source email server in to its package. Zimbra is a system of well connected / integrated multiple open source software which delivers enterprise quality to it. This article explains most important components which helps to build the enterprise product.

Projects