DromeAudio is a small audio manipulation and playback library. It features a simple API for loading, generating, processing, and playing audio. Some of its features include loading and saving WAV sounds, loading Ogg Vorbis sounds, audio mixing/playback, and dynamic audio processing effects such as pitch shifting and echo.
SOFEA is a Matlab object-oriented Finite Element toolkit. It includes the book, A Pragmatic Introduction to Finite Element Analysis for Structural Engineers. The toolkit provides linear transient thermal analysis capabilities, with stress analysis and coupled multi-physics coming shortly.
Mercat is a light-weight, cross platform programming language. It is garbage collected and self hosting and produces portable byte-compiled binaries that can be executed on any platform with the appropriate interpreter. Interpreters are available for Linux, DOS (32-bit) and DOS (16-bit) and the interpreter source should be easily compilable for other platforms.