ZXTune is a set of portable cross-platform applications (GUI/CLI) intended to play chiptunes. It features advanced ripping possibilities that let you search for music in big data sets. Supported ZX Spectrum chiptunes formats include AY, AS0/ASC, FTC, GTR, PSC, PSG, PSM, PT1, PT2, PT3, SQT, ST1, ST3, STC, STP, TXT, TurboSound, VTX, YM, CHI, DMM, DST, PDT, SQD, STR, TF0/TFE, TFC, TFD, and COP. Supported PC chiptunes formats include 669, AMF, DMF, FAR, FNK, GDM, IMF, IT, LIQ, PSM, MDL, MTM, PTM, RTM, S3M, STIM, STM, STX, ULT, XM. Supported Amiga chiptune formats include DBM, EMOD, MOD, MTN, IMS, MED, OKT, PT36, SFX. Supported Atari chiptune formats include DTM, GTK, TCB. The Acorn chiptune format DTT is supported. Supported compressed formats include CHARPRES, CC3, CC4, CC4PLUS, DSQ, ESV, GAM, GAMPLUS, HRUM, HRUST1, HRUST2, LZH1, LZH2, LZS, MSP, PACK2, PCD61, PCD62, TLZ, TLZP, TRUSH. Supported archived/container formats include FDI, HOBETA, HRIP, LHA, RAW, SCL, TD0, TRD, ZXZIP, ZIP, RAR, SNA128, and Z80.
Mettā is an OS for mobile, multimedia, and social applications. Mettā's purpose is to be easily deployable over a range of mobile and home devices, without tedious setup procedures, while allowing people to communicate easily in a very ambient way and express themselves freely by creating, modifying, and publishing text, audio, and video information in a simple way. Mettā's flexibility comes from transparent resource manipulation and transparently distributing computing tasks between nodes on the network, while maintaining data integrity and privacy.
Evolvotron is an interactive "generative art" application to evolve images/textures/patterns through an iterative process of random mutation and user-selection driven evolution. If you like lava lamps, and never got tired of the Mandelbrot set, this could be the software for you. It's implemented using Qt, and is multithreaded.