Download the LAME MP3 Encoder here. The LAME is a well-known free and open-source software project that is used to compress and encode audio files in the MP3 format. You will note that this is a command-line application. It is widely considered to be one of the best MP3 encoders available. The user GUI which makes it easier to use. LAME produces a high level of quality and its ability to achieve a very good balance between file size and sound quality.