Multiplatform GUI of MP3Gain which adjusts volume of MP3 files
Runabc is a user interface supporting abc music notation software
Analyze audio files for Peak levels, peak and total RMS, and DC offset
Fast, bit-perfect audio editor that doesn't modify samples needlessly
C++ class library for sound analysis, synthesis, and morphing
Transcribe audio files to written text
DuMP3 is a duplicate and similar file finder.