wxLame is described as 'free front-end for the LAME MP3 encoder'. There are four alternatives to wxLame for Windows. The best alternative is LameXP, which is both free and Open Source. Other great apps like wxLame are winLAME (Free, Open Source), LameDropXPd (Free, Open Source) and ALL2LAME (Free).
LameXP is an Audio Encoder Front-End, a graphical user-interface for a number of audio encoders. It was developed to support a huge number of input formats. File formats are detected reliably using MediaInfo.
[No longer maintained, but downloadable] ALL2LAME is a free Windows front-end for the LAME MP3 encoder. It's very easy to use: 1. Choose the files you want to encode. 2. Set the LAME switches. 3. Press the Encode button.