The best CD Ripper alternative to MP3Gain is Zortam, which is free. If that doesn't work for you, our users have ranked more than 10 alternatives to MP3Gain, but unfortunately only two of them are CD Rippers.
Zortam Mp3 Media Studio is all-in-one Mp3 application suite. It has several modules such us Zortam Mp3 Auto Tagger, Mp3 Organizer, ID3 Tag Editor, Mp3 Player, Mp3 Normalizer, BPM (Beats Per Minute) Analyzer, CD and DVD Ripper, Mp3 to Wav converter.
soundKonverter is a frontend to various audio converters. The key features are: Audio conversion. En-/decoding. Replay Gain. CD ripping. It is extendable by plugins and supports many backends. It supports reading and writing tags for many formats, so the tags are preserved when c.
This alternative is disputed. soundKonverter is a legitimate MP3Gain alternative, but it might have issues that some users think are important.
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It's just a front-end that supports multiple converters that need to be installed separately, including an MP3Gain-like engine, which may not even be possible to install as-is on Linux, so it's misleading to say that because soundKonverter works on Linux it's a Linux equivalent to MP3Gain. It's far from such a thing.