Game Server Manager is a free Android app developed by dentier. It is a utility tool that allows users to check the status of their favorite game servers for Call of Duty, CS GO, CS Source, and Team Fortress 2. With this app, users can see the name, ping, player count, max player, currently playing map, and player list for each server.

Moreover, if users have the RCON of the server, they can fully manage it by changing the map, gametype, kicking players, temporarily or permanently banning them, unbanning them, and accessing the server console. The app also supports other games such as Call of Duty 2, Call of Duty 4, Counter-Strike Global Offensive, Counter-Strike Source, Counter-Strike 1.6, Left 4 Dead 1 & 2, and all HLDS games like TFC.

Overall, Game Server Manager is a useful app for gamers who want to keep track of their favorite game servers and manage them with ease. Users can also submit feature requests and report bugs to the developer.