db4o is an object database for Java and all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.
Speex is a patent-free compression format designed especially for speech. It is specialized for voice communications at low bit-rates in the 2-45 kbps range. Possible applications include Voice over IP (VoIP), Internet audio streaming, audio books, and archiving of speech data (e.g. voice mail).
Sofia-SIP is a SIP user agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. The primary target platform is GNU/Linux. Sofia-SIP is based on a SIP stack developed at the Nokia Research Center.
LightBlue is a cross-platform Python Bluetooth API for Mac OS X, GNU/Linux, and Python For Series 60. It provides easy programmatic access to device and service discovery, RFCOMM sockets, L2CAP client sockets, sending and receiving files over OBEX, service advertising, and local device information.
FusionCharts Free is a flash charting component that can be used to render data-driven and animated charts for your Web applications and presentations. It is a cross-browser and cross-platform solution that can be used with ASP.NET, ASP, PHP, JSP, ColdFusion, Ruby on Rails, simple HTML pages, or even PowerPoint presentations to deliver interactive and powerful flash charts. You do not need to know anything about Flash to use FusionCharts. All you need to know is the language in which you're programming.
SILC Runtime Toolkit (SRT) provides useful utility functions for application programmers. SRT can be used as the main runtime in any application. It provides an application main loop, hash tables, lists, atomic operations, threads, locks, queues, a file descriptor stream, a socket stream, network routines, a finite state machine, a memory pool, a random number generator, buffers, regular expressions, and many other features. It natively supports Unix/Linux, Windows, Mac OS X, and Symbian OS platforms.