Open Game Panel - OGP is a game server control panel.
IGDB - An open video game database
Pterodactyl - Pterodactyl is the free game server management panel designed by users, for users.
FreeToGame - Your digital game store where everything is free!
WindowsGSM - A Game Server Manager works on Windows Platform.
The Visual Novel Database - VNDB.org strives to be a comprehensive database for information about visual novels.