Gamepedia is described as 'game cataloging application for everyone running Mac OS X. It lets you keep track of your game progress, where your games are and which ones you want to buy in the future' and is an app in the Gaming Software category. There are six alternatives to Gamepedia for Online / Web-based, Mac and Linux. The best alternative is RAWG, which is free. Other great apps like Gamepedia are FANDOM (Free), Miraheze (Free, Open Source), Tellico (Free, Open Source) and MyWikis (Paid).
Miraheze is a free wiki farm, you can request your wiki which is 100% free and has no ads. The code of Miraheze is opensource (Github.com/Miraheze). You can change your logo, request extensions you need, and many other features. Help is provided via email, IRC, Phabricator.
fennel DVDManager (aka fsDM) is our next-generation DVD manager (sic) for Mac OS X. With its clean interface, DVDManager makes maintaining your DVD library as easy as Macintosh! Quick, Simple, Easy & Fun! It's time to manage the workflow of your DVDs with Style.