Open-Xchange sets the standard for email, messaging and collaboration in the cloud, with all the advantages of open data. It’s very easy to implement and support, and scales better than anything else on the market.

Integrates with your existing backend processes: billing, provisioning, databases and mail servers. It fits most complex heterogeneous environments without having to remove components, such as email servers. Lets you use your tools for authentication, user setup, system administration, procurement, accounting and email storage. ...

GUPnP is an object-oriented open source framework for creating UPnP devices and control points, written in C using GObject and libsoup. The GUPnP API is intended to be easy to use, efficient and flexible.

The GUPnP framework was born out of frustration with libupnp and its mess of threads. GUPnP is entirely single-threaded (though asynchronous), integrates with the GLib main loop, and provides the same set of features as libupnp while hiding most of the UPnP internals through an elegant object-oriented design....

OpenNMS is the world's first enterprise grade network management platform developed under the open source model. It consists of a community supported open-source project as well as a commercial services, training and support organization.

JBoss acquired, opened and has developed the Java and Web Services distributed transaction management technology owned by Arjuna Technologies and HP. The acquisition included Arjuna Transaction Service Suite (ArjunaTS) and Arjuna's Web Services Transaction implementation, an implementation supporting both leading web services specifications Web Services Transaction (WS-TX) and Web Services Composite Application Framework (WS-CAF)....

Avogadro is an advanced molecular editor designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science, and related areas. It offers flexible rendering and a powerful plugin architecture.

Photoshop file format plugin for reading and writing image layers of Paint Shop Pro files.

Last Exit is a player for Last.fm.,

Use instead of fixtures to create valid objects for your Ruby test suite.,

Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. Google uses Protocol Buffers for almost all of its internal RPC protocols and file formats.

args4j is a small Java class library that makes it easy to parse command line options/arguments in your CUI application.