FLAC is a free lossless compressed audio format which supports streaming and archival. The FLAC project maintains the format and provides a reference encoder/decoder and input plugins for several popular audio players.
WavPack is a free, fast, flexible and featureful encoder and decoder for audio streams. Besides lossless, it can perform lossy and hybrid (lossy+correction file) encodings.
The MP3elf is a low-cost ethernet connected MP3 player that receives an MP3 stream from a local area network server
and delivers it to amplified speakers or a Hi-Fi system. The hardware is based on the ST-013 MP3 decoder chip and a TINI Java SIM
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