Jug is a task-based parallelism framework. Jug allows you to write code that is broken up into tasks and run different tasks on different processors. It uses the filesystem to communicate between processes and works correctly over NFS, so you can coordinate processes on different machines. Jug is a pure Python implementation and should work on any platform that can run Python.
GLOBE_3D is a real-time 3D engine. It features unconditionally portable sources (one set of sources for all platforms), real-time rendering (fast with a 3D hardware-accelerated graphics card), full eye movements and rotations, display of combinations of colors, materials, and textures, transparency, multiple area rendering with the portal technique (e.g. for inner scenes), collision detection, binary space partition (BSP), input-output of 3D objects or groups of objects linked to each other by portals, easy management of resources like textures (.bmp and .tga), BSP trees, and objects stored in .zip files, screenshots (.bmp) and video captures (.avi), multi-view support, and vectorized geometry support.
Industria is a collection of portable R6RS Scheme libraries for cryptography (AES, DES, Blowfish, HMAC, MD5, SHA-1, SHA-2, RSA, DSA, etc.), zip/gzip/zlib decompression, disassembly of amd64 machine code, Off-The-Record messaging, bytevector pack/unpack syntax, TLS connections via custom binary ports, and more.
Ansilove/PHP is a set of tools that convert ANSi and artscene-related file formats into PNG images, supporting ANSi (.ANS), PCBOARD (.PCB), BiNARY (.BIN), ADF (.ADF), iDF (.IDF), TUNDRA (.TND), and XBiN (.XB) formats. It includes a command line converter and a library for doing "on the fly" conversions. It creates optimized 4-bit PNG files and supports SAUCE, 80x25, 80x50, Amiga fonts, and iCE colors. It supports 14 MS-DOS charsets (IBM PC, Baltic, Cyrillic, French Canadian, Greek (CP737 and 869), Hebrew, Icelandic, Latin-1, Latin-2, Nordic, Portuguese, Russian, Turkish) as well as unofficial charsets (Armenian, Persian).
Squirrel is a light-weight programming language (around 6000 lines of code) that features higher-order functions, classes/inheritance, delegation, tail recursion, generators, cooperative threads, exception handling, reference counting and garbage collection on demand. It has a C-like syntax.