3D Filament Profiles is a free, community-driven filament catalogue and a manual personal inventory, with strong HueForge colour tooling and a broad hardware reference. It's a fine fit if you mainly want a place to browse filaments and keep your own spool list by hand, and you don't need your tool to talk to the printer.
SimplyPrint is a connected filament manager: it reads the G-code of every print and deducts filament automatically, so there's nothing to weigh or subtract, across any printer brand. It adds native NFC read and write, Bambu and Creality AMS auto-import, native iOS and Android apps, direct Dymo and Zebra label printing, and the open, MIT-licensed Open Filament Database (143 brands), which you can download, embed and edit in the browser. And the filament manager is free on every plan. If you want the biggest catalogue to browse and don't mind logging usage yourself, that's 3D Filament Profiles; if you want tracking that just happens off your printer, that's SimplyPrint.