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FLAC - A free, open source codec for lossless audio compression and decompression
FLAC Frontend - [No longer maintained, but downloadable]
WavPack - WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a...
LameXP - LameXP is an Audio Encoder Front-End, a graphical user-interface for a number of audio encoders.
wxLame - wxLame is a free front-end for the LAME MP3 encoder.
Opus Interactive Audio Codec - Opus is a totally open, royalty-free, highly versatile audio codec.