More Community Project suggestions added

Just adding some initial suggestions for additional "such as" community projects - there are so many fantastic ones out there...
Added reactiveUI and Splat too

So many more to add....
Formatting

I can see this list getting out of hand... who decides what is "great"?
ILSpy and MonoGame added
Merge PR. Add separate community projects list.
Merge branch 'slodge-patch-1'