Ribbon is a client side IPC library that is battle-tested in cloud. It provides Load balancing, Fault tolerance, Multiple protocol (HTTP, TCP, UDP),  support in an asynchronous and reactive model Caching and batching.


Ribbon - IPC library with built in software load balancers

Patroni is a template for you to create your own customized, high-availability solution using Python and - for maximum accessibility - a distributed configuration store like ZooKeeper, etcd, Consul or Kubernetes. Database engineers, DBAs, DevOps engineers, and SREs who are looking to quickly deploy HA PostgreSQL in the datacenter-or anywhere else-will hopefully find it useful.

Patroni - A template for PostgreSQL High Availability with ZooKeeper, etcd, or Consul

Spilo is a Docker image that provides PostgreSQL and Patroni bundled together. Patroni is a template for PostgreSQL HA. Multiple Spilos can create a resilient High Available PostgreSQL cluster. For this, you'll need to start all participating Spilos with identical etcd addresses and cluster names.
 
Spilo is currently evolving: Its creators are working on a Postgres operator that would make it simpler to deploy scalable Postgres clusters in a Kubernetes environment, and also do maintenance tasks. Spilo would serve as an essential building block for this.

Spilo is a Docker image that provides PostgreSQL and Patroni bundled together. Patroni is a template for PostgreSQL HA. Multiple Spilos can create a resilient High Available PostgreSQL cluster. For this, you'll need to start all participating Spilos with identical etcd addresses and cluster names.

Spilo - Highly available elephant herd: HA PostgreSQL cluster using Docker

evQueue is an open source job scheduler and queueing engine. It features an event-driven C++ engine and a PHP / MySQL web control interface which provides tasks monitoring and creation. It provides both simple task execution and complex task chaining (workflow) using an easy to use drag & drop web interface. Workflow description includes output linking to input, conditions, loops... Queues management provides an easy way for task parallelization and resource control.
 
The network API provides an easy way, XML based, for synchronous or asynchronous workflow launching and control, allowing tasks to be launched from external applications or web pages. You can thus execute heavy tasks on a remote (dedicated) machine to save resources on your web frontends while providing live reporing of the treatment to you users.

evQueue is an open source job scheduler and queueing engine. It features an event-driven C++ engine and a PHP / MySQL web control interface which provides tasks monitoring and creation. It provides both simple task execution and complex task chaining (workflow) using an easy to use drag & drop web interface. Workflow description includes output linking to input, conditions, loops... Queues management provides an easy way for task parallelization and resource control.

evQueue - Job scheduler and queueing engine

Cobar is a proxy for sharding databases and tables,compatible with MySQL protocal and MySQL SQL grama,underlying storage only support MySQL for support foreground business more simple,stable,efficient and safety。
 
It supports sharding, add new MySQL instance as your business grows. Both Cobar server and underlying MySQL is clustered,business will not suffer with single node fail.

Cobar is a proxy for sharding databases and tables,compatible with MySQL protocal and MySQL SQL grama,underlying storage only support MySQL for support foreground business more simple,stable,efficient and safety。

Cobar - Proxy for sharding databases and tables

Serf is a decentralized solution for service discovery and orchestration that is lightweight, highly available, and fault tolerant.Serf runs on Linux, Mac OS X, and Windows. An efficient and lightweight gossip protocol is used to communicate with other nodes. Serf can detect node failures and notify the rest of the cluster. An event system is built on top of Serf, letting you use Serf's gossip protocol to propagate events such as deploys, configuration changes, etc. Serf is completely masterless with no single point of failure.
 
Its other features include: 
<ul>
<li>Discovering web servers and automatically adding them to a load balancer</li>
<li>Organizing many memcached or redis nodes into a cluster, perhaps with
something like <a href="https://github.com/twitter/twemproxy">twemproxy</a> or
maybe just configuring an application with the address of all the
nodes</li>
<li>Triggering web deploys using the event system built on top of Serf</li>
<li>Propagating changes to configuration to relevant nodes.</li>
<li>Updating DNS records to reflect cluster changes as they occur.</li>
<li>Much, much more.</li>
</ul>

Serf is a decentralized solution for service discovery and orchestration that is lightweight, highly available, and fault tolerant.Serf runs on Linux, Mac OS X, and Windows. An efficient and lightweight gossip protocol is used to communicate with other nodes. Serf can detect node failures and notify the rest of the cluster. An event system is built on top of Serf, letting you use Serf's gossip protocol to propagate events such as deploys, configuration changes, etc. Serf is completely masterless with no single point of failure.

serf - Service orchestration and management tool

HAProxy is a fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads while needing persistence or Layer7 processing. Supporting tens of thousands of connections is clearly realistic with todays hardware. 

HAProxy - The Reliable, High Performance TCP/HTTP Load Balancer

OpenCDN aims at the development of an application-level Content Delivery Network, suitable for replication and splitting of live and recorded multimedia content. It uses Relay technology, which splits incoming media packets for each downstream flow. Media distribution is hierarchically arranged among participating Nodes, coordinated by a centralized control unit. 
 It could deliver of Live Streaming contents to millions of viewers. Its development is based on Apple Darwin Streaming Server. 
 Source code location: <A HREF="http://sourceforge.net/projects/opencdn/" target="_blank">http://sourceforge.net/projects/opencdn/</A>

OpenCDN aims at the development of an application-level Content Delivery Network, suitable for replication and splitting of live and recorded multimedia content. It uses Relay technology, which splits incoming media packets for each downstream flow. Media distribution is hierarchically arranged among participating Nodes, coordinated by a centralized control unit.

OpenCDN - Content Delivery Network

Akka is the platform for the next generation event-driven, scalable and fault-tolerant architectures on the JVM. It helps to write simpler correct concurrent applications using Actors, STM & Transactors. It could scale out on multi-core or multiple nodes using asynchronous message passing. For fault-tolerance it adopts the Let it crash or Embrace failure model to build applications that self-heals, systems that never stop.

Projects