LameXP - LameXP is an Audio Encoder Front-End, a graphical user-interface for a number of audio encoders.
Multi frontend - Multi frontend is a Windows GUI (grafical user interface) for the following console audio...
FLAC - A free, open source codec for lossless audio compression and decompression
winLAME - winLAME is an encoder for several audio formats, including mp3 (MPEG Layer 3), Ogg Vorbis and more.
FLAC Frontend - [No longer maintained, but downloadable]
Format Factory - Format Factory is software that allows the user to convert media into various file formats. The software is a product of PC Free Time, a Chinese software development company. Read more about Format Factory.