https://datomatic.no-intro.org/index.php?page=search&s=64 has dats of the same format supported by a variety of tools. They tend to focus on the purer dumps where something like TOSEC or goodtools (responsible for the various naming conventions you might see on older systems
https://emulation.gametechwiki.com/index.php/GoodTools ) does more things.
http://advanscene.com/html/index.php has some more.
https://wiki.recalbox.com/en/tutorials/games/generalities/isos-and-roms/differents-groups covers some differences between things.
There tends to be a break between older devices and anything on a DVD (and possibly CD even if the likes of DS ROMs routinely exceed the sizes seen there).
Not a "use this" suggestion (especially not for large consoles, and there is a reason I still have offlinelist going on in various places) but hopefully gets you somewhere good soon enough.