Speex is described as 'Patent-free audio compression format designed for speech and also a free software speech codec that may be used on VoIP applications and podcasts' and is an app. There are three alternatives to Speex for Windows, Linux, Mac, Winamp and foobar2000. The best Speex alternative is Vorbis, which is both free and Open Source. Other great apps like Speex are Opus and TAK.
Ogg Vorbis is a fully open, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel.
Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but also intended for storage and streaming applications.
»TAK – [T]om’s lossless [a]udio [k]ompressor / [T]oms verlustfreier [A]udio[k]ompressor – is, as the name already suggests, a lossless audio compressor, similar to FLAC, WavPack and Monkey’s Audio.
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