framework for audio synthesis. It aims to be as powerful as Csound but with the programming features of C++. Nsound tries to make the process of generating complex and interesting sound as easy for the programmer as possible.
Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.
a multi-platform game library for C/C++ developers that provides many functions for graphics, sounds, player input (keyboard, mouse, and joystick), and timers. It also provides fixed and floating point mathematical functions, 3D functions, etc...
Speech for Windows® applications, includes freely distributable text-to-speech engines (in U.S. English and Simplified Chinese) and speech recognition engines (in U.S. English, Simplified Chinese, and Japanese).
a cross platform audio library and toolset to let you easily implement the latest audio technologies into your title. FMOD now supports 13 platforms! Win32, Win64, WinCE, Linux, Linux64, Macintosh (os8/9/10/x86) PS2, PSP, PS3, Xbox, Xbox 360
a library for reading and editing the meta-data of several popular audio formats. Currently it supports both ID3v1 and ID3v2 for MP3 files, Ogg Vorbis comments and ID3 tags and Vorbis comments in FLAC files.
audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and
a high-level audio API. It can play Ogg Vorbis, MP3, FLAC, uncompressed WAV, AIFF, MOD, S3M, XM, and IT files. For audio output, Audiere supports DirectSound or WinMM in Windows, OSS on Linux and Cygwin, and SGI AL on IRIX
a game programming library for C/C++ developers distributed freely, supporting the following platforms: DOS, Unix (Linux, FreeBSD, Irix, Solaris, Darwin), Windows, QNX, BeOS and MacOS X. It provides many functions for graphics, sounds, player input, etc..