WvStreams is a library set composed of a number of parts. Among them are WvIPStreams (WvTCPStream and WvUDPStream), WvStrings (yet another C++ String class), WvCrypto Streams (including an easy way to add SSL support to applications), UniConf (a universal configuration system), WvLog (nice, simple handling of log files), and a whole host of other goodness. These are the base classes used to build programs such as the ever popular WvDial, TunnelVision, FastForward, KWvDial, and retchmail.
Device::ParallelPort is a Perl API that allows low level access to the parallel port of most computers. It does this by using a number of drivers, which can be customized and added to, including Linux (direct and parport), Win32, Script, Dummy, and more. It also contains a number of direct access devices including an example printer and a relay controller card.
oRTP is a library implementing the Real-time Transport Protocol (RFC3550), written in C. It is easy to use and provides a packet scheduler for sending and receiving packets on time, adaptive jitter compensation, automatic sending of RTCP compound packets, and the RTCP parser API. It works with IPv6.
NovaTK is an object-oriented, cross-platform GUI toolkit. One of the focuses of NovaTK is to facilitate rapid development of cross-platform applications requiring fewer lines of code. The event system is based upon a powerful callback mechanism that makes application design simpler, easier to read, and logical.
Shilosh OS provides a secure and stable operating system based on a highly modified Linux kernel, with its own package system similar to BSD's "ports", BSD Init scripts. Compatible with x86 and Power PC, it is also 99% compatible with Windows 9x. It is easy to use and includes complete documentation in many languages.