Interesting idea. I want this to exist. It's needed now that many projects have left github. The closest thing I can think of to what you want to make are those

Interesting idea. I want this to exist. It's needed now that many projects have left github. The closest thing I can think of to what you want to make are those "awesome x" repos on github which list projects related to x (e.g.: https://github.com/mbasso/awesome-wasm https://github.com/mbasso/awesome-wasm) It needs a memorable name like wesource or youcode. You'll probably want a way for maintainers to claim a project (like google allows businesses to do on maps). Community management in general seems hard. The other hard part will determining relevancy. What do you show on the homepage? Ad-supported or donation-based? Look to large wikis and public resources like everymac.com for inspiration maybe.