GTK, which stands for the Gimp ToolKit, is a library for creating graphical user interfaces. It is designed to be small and efficient, but still flexible enough to allow the programmer freedom in the interfaces created. GTK provides some unique features over standard widget libraries.
Adflib is a free, portable, open and documented implementation of the Amiga filesystem. ADFlib and the related documentation ADF FAQ allow you to easily access media formatted with the Amiga filesystem from your application. This C library is delivered with a little utility like unZip, but for ADF dump files created with UAE, the amiga emulator. The ADF FAQ explains in details the Amiga filesystem.
Hood is a C++ user-level threads library for multiprogrammed, shared-memory multiprocessors. Hood is designed primarily for parallel programs, and it is especially effective for dynamic, highly asynchronous parallelism. Hood's thread scheduler is a non-blocking implementation of the work-stealing algorithm that has been shown to be efficient both in theory and in practice. The current version fully supports Solaris (SPARC) and partially supports Linux: due to the Linux implementation of pthreads, many library calls are not safe for use within Hood threads (this problem does not exist under Solaris).
libmidixx is a C++ library to manipulate MIDI sequences. It is intended for a multimedia application that handles playback, recording, and editing of MIDI sequences, though the current version just implements playback only. libmidixx supports OSS, ALSA, and serial (tty) MIDI ports, and also comes with a user-space sequencer implementation, which does a fair job on a lightly-loaded machine.
The Model Railroad System is a software package that can help you run your railroad. It allows you to operate your layout, from running trains to working your signals and switches. It has support for a network of Bruce Chubb CMR/I USIC, SUSIC, and/or SMINI nodes, and/or a network of Lenz's XPressNet DCC nodes. Azatrax USB-connected Model Railroad Detectors are supported. Software to create switch lists for freight car forwarding and create timetables for your railroad are included. There is software to help with photographing your trains, and to compute the correct value for those pesky dropping resistors for LEDs and/or incandescent lamps.