AAC/MP4

  1. MPEG4IP - Open source MPEG4 multimedia.

Codecs

  1. Audio Coding - FAAC/FAAD encoder/decoder.
  2. Nero Digital Audio - Reference quality MPEG-4 & 3GPP audio codec.

Information

  1. Fraunhofer IIS - AAC-LD.
  2. Fraunhofer IIS - AAC-HE.

MP3

Codecs

  1. LAME MP3 encoder - Homepage.
  2. Lame MP3 encoder binaries at rarewares.org.

Cutters

  1. MP3 Cutter - Cut out pieces without decoding.
  2. MP3 Direct Cut - Edit files without decoding.
  3. musiCutter - MP3 and OGG Vorbis joiner/cutter.

Frontends

  1. AdvaLAME Suite - Frontend for Lame, based on RazorLame.
  2. RazorLame - Frontend for Lame.

Information

  1. Coding Technologies - MP3pro and AACplus.
  2. Fraunhofer IIS - Inventors of MP3.
  3. MP3: the definitive guide.
  4. MP3 decoder accuracy tests. Outdated but kept for historical reference.
  5. MP3 Tech - Information, tests & source codes.
  6. MP3prozone.

Tools

  1. EncSpot - Guess what encoder is used.
  2. LameTag - Reads lame headers and shows preset used.
  3. MAD Library directshow filter.
  4. MP3-Gain - Analyzes and adjusts volume losslessly.
  5. VBRFix - Fix your broken variable bitrate files.

Musepack

  1. Musepack.net - Homepage.

Tools

  1. MPC Batch Encoder - Frontend.

Ogg Vorbis

  1. Ogg Vorbis - Homepage.

Binaries

  1. aoTuV - Aoyumi's tuned version.
  2. Garf - Special tuned versions for higher bitrates.
  3. List of different compiles and versions.

Tools

  1. Directshow filters - For Ogg Vorbis, Speex, Theora and FLAC.
  2. WinVorbis and WinVorbix - Graphical comment editor/encoder.