Other Implementations
FreeBSD contains an independently developed implementation of the OSS API, which includes, among other things, in-kernel resampling, mixing (vchans), equalizer, surround sound, and independent volume control for each application. It also supports bit-perfect mode.
NetBSD and OpenBSD support a compatibility mode for the OSS API, by providing the soundcard.h header file and the libossaudio library, which internally operate using the native Sun-like audio interface.
Solaris and OpenSolaris uses a fork of OSS4 call Boomer. It combines the OSS4 framework (audio and mixer) together with Sun's earlier SADA(/dev/audio) API.
Read more about this topic: Open Sound System