Verify Game (verify_game.sh) is a Linux-native script to check and verify your video game backups (ROMs/ISOs/etc.) against trusted sources. It's meant to fill the gap for this kind of utility under Linux. It's intended to just verify games, so there are no additional ROM management features included such as renaming, but it does include a few handy features such as transparent decompression and parallel verification.
Please see the Verify Game page for details and the download link.
This is one of the many scripts I mentioned in my general update that I've been tinkering with for the last few years, hence the immediate jump to version 3.1. :-) Expect more to follow.