FilamentManager is described as 'This OctoPrint plugin makes it easy to manage your inventory of filament spools. You can add all your spools and assign them to print jobs. The Filament Manager will automatically track the amount of extruded filament so you can always see how much is left on your spools' and is a 3D Printing tool in the system & hardware category. There are nine alternatives to FilamentManager for a variety of platforms, including Web-based, Self-Hosted, iPhone, iPad and Linux apps. The best FilamentManager alternative is FilaMan, which is both free and Open Source. Other great apps like FilamentManager are FilaMeter, SimplyPrint, SpoolBuddy and FilaTrack.