It has become a thing to label a big collection (usually open source) as awesome and there are several such collections around for many programming languages. In fact the C code collection’s first entry is to one of them.
That said they are pretty awesome, often having links to many related and useful open source projects. My only problem with the likes of GitHub and SourceForge etc. is the sheer quantity of excellent stuff on there. These awesome links are one way to “tame” them.
So now there’s a new link up top for C# and MonoGame links and a couple of entries to start it off.