Signal boost for GamePhobias, a wiki-style website dedicated to categorizing games based on content and trigger warnings. Users can either view content warning categories to find games that do and don’t contain the triggering content, or search for specific games to see exactly what content warnings are attached to that title (as well as brief, almost exclusively non-graphic descriptions as to specific scenes/levels containing that content).
It’s a very, very new wiki (IIRC it launched late August) and so its offerings are very paltry right now, and I would seriously encourage anyone with experience with games, wikis, and/or both to contribute however they can.