PortAudio is a free, cross-platform, open-source, audio I/O library. It lets you write simple audio programs in 'C' or C++ that will compile and run on many platforms including Windows, Macintosh OS X, and Unix (OSS/ALSA). It is intended to promote the exchange of audio software between developers on different platforms. Many applications use PortAudio for Audio I/O.
SMIX is a freeware programming library that will play up to 8 simultaneous sounds. The sounds are mixed in real time and played on any Sound Blaster compatible sound card. It provides transparent support for a variety of sound cards and will used auto-initialized 16-bit output if possible.
SBDSP plays VOC digitized voice files directly on a Sound Blaster or compatible sound card without without using Creative Labs CT-VOICE driver
Programming library that plays and records VOC files in the background on a Sound Blaster sound card using Creative Labs' CT-VOICE driver.