winLAME uses the LAME MP3 encoder for encoding for most popular audio formats, including MP3, Opus, and Ogg Vorbis.
winLAME lets you read in audio tracks from CDs or encode audio files from your hard drive. The intuitive wizard-style user interface makes it easy to set up encoding settings. Multicore CPUs are used to parallelize encoding tasks.
This is the portable version. The installer, should you need it, can be gotten from the author's site.