CartDex is a self-hosted ROM library indexer I built because every other option either required an account, phoned home, or tried to be a cloud service. This runs on your hardware. It reads your files. It reports to you.

It indexes your ROMs against No-Intro and Redump DAT files, tracks completion across systems, and gives you a clean dashboard to browse what you actually have. No subscription. No telemetry. No cloud sync that owns your library.

I maintain this as a hobby project. It is open source and does exactly what it says. If that sounds useful, the source is on GitHub.