dBpoweramp has two versions: free and Reference (paid).

Feature	Free	Reference
CD Ripper
Audio Converter
Windows Explorer Shell Integration *
ID Tag Editing
mp3 Encoding
CD Ripper: High Resolution Art
CD Ripper: Preview
CD Ripper: Compilation CD Handling
CD Ripper: Secure Ripping
CD Ripper: C2 Pointers, HTOA, drive offset removal
Profiles
Floating Point Decoding / Encoding
Multi Core Simultaneous Encoding
Dynamic File naming
DSP Effects (HDCD *, EBU R128 normalization)
Non-Expiring PerfectMeta (metadata)
Batch Conversions
Filter Batch Conversions on Artist, Album, etc ++

* Windows only
++ R16 or newer