Mitch - The unofficial mobile app for itch.io
HyperSpin - HyperSpin is an animated arcade frontend for Windows for use on Home Arcade Machines.
GameDatum.com - A platfrom of free online games. A list of all the available online free games from various producers online.
LaunchBox - LaunchBox is a portable, box-art-based games database and launcher for DOSBox, emulators, arcade cabinets, and PC Games. Download it free!
ScienceGameCenter - The goal of the Science Game Center is to demonstrate to teachers, scientists, museums, and parents the myriad ways games can be used to improve education in math and science.
OfflineList - A widely-used, multi-platform ROM manager.