Speex
Speex is a patent-free audio compression format designed for speech and also a free software speech codec that may be used on VoIP applications and podcasts.
Opus Interactive Audio Codec
Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmi ...
TAK
»TAK – [T]om’s lossless [a]udio [k]ompressor / [T]oms verlustfreier [A]udio[k]ompressor – is, as the name already suggests, a ...
Vorbis
Ogg Vorbis is a fully open, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic ...