MP3Gain
MP3Gain analyzes and losslessly adjusts mp3 files to a specified target volume. It does not simply do peak amplitude normalization. Instead, it performs statistical analysis to determine how loud the file actually sounds to the human ear.
Infra Recorder
InfraRecorder is a high quality free CD/DVD burning solution for Microsoft Windows. It offers a wide range of powerful features; all through an easy to use application interface and Windows Explorer integration.
LAME
LAME is an educational tool to be used for learning about MP3 encoding. The goal of the LAME project is to improve the psycho acoustics, quality and speed of MP3 encoding. LAME is not for everyone - it is distributed as source code only and requires the ability to use a C compiler. However, many popular ripping and encoding programs include the LAME encoding engine.
Burn
There are a lot of ways to approach burning discs. Burn keeps it simple, but still offers a lot of advanced options.
Create data discs with advanced data settings. Create video and audio discs, Burn will convert if needed. Create DVD-Video discs. Recreate discs. Burn doesn't reinvent the wheel, it uses many powerful open source Unix utilities and is also open source.
CDex - A Free Digital Audio CD Extractor
CDex is a free Audio CD ripper, extractor and converter for various formats and encoders, e.g. MP3, AAC, WMA, FLAC, OGG, WAV, MP2, Musepack, Ape, VQF and many others. It features advanced jitter correction, ID3v2+v1 tagging, audio normalization, transcoding of compressed audio files, analog input recording and also meta tagging with CDDB and Musicbrainz. CDex has been translated to various languages.