RazorLame is a so-called "front-end" for use with LAME

LAME is a great MP3 Encoder: it's very fast, it produces high-quality files, has many advanced features (like Variable Bitrates and Joint-Stereo), and it's open source. Unfortunately, it is a command line utility, and that is where RazorLame comes in: It provides an easy-to-use graphical user-interface which makes MP3-encoding even easier!