REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services.

CoSign: Secure, Intra-Institutional Web Authentication

Gitblit is an open-source, pure Java stack for managing, viewing, and serving Git repositories.
It's designed primarily as a tool for small workgroups who want to host centralized repositories.

XWiki Enterprise is a professional wiki that has powerful extensibility features such as scripting in pages, plugins and a highly modular architecture.

This is the world's first open source HTML5 SIP client entirely written in javascript for integration in social networks (FaceBook, Twitter, Google+), online games, e-commerce websites...
The client can be used to connect to any SIP or IMS network from your preferred browser to make and receive audio/video calls and instant messages.

The Caja Compiler is a tool for making third party HTML, CSS and JavaScript safe to embed in your website. It enables rich interaction between the embedding page and the embedded applications. Caja uses an object-capability security model to allow for a wide range of flexible security policies, so that your website can effectively control what embedded third party code can do with user data.

Font Awesome delivers with 70 shiny new icons in version 2.0. This giant set of new icons was requested on the Font Awesome GitHub project and includes icon parity with Bootstrap 2.0.3.

Froxlor: The server administration software for your needs.
Developed by experienced server administrators this open source (GPL) panel simplifies the effort of managing your hosting platform.