It depends what you are looking for. Your description is actually kinda confusing.
Do you want something to allow the install of games from a self hosted server? Then you’re looking for https://gamevau.lt
Do you want “one launcher to rule them all” that allows for local aggregation of all available games from all platforms? Then you’re looking for https://playnite.link
Do you want a front end for game servers? Then you’re looking for https://pterodactyl.io or https://cubecoders.com/AMP
Do you want something else? Give us a little more info and we can likely point you in the right direction.
Do you mean Calibre?