If you are taking suggestions for the future, I would recommend going for .NET Core instead of Mono for C# and F#, the performance enhancements are significative, and it’s portable across all major OS.
EDIT: Reading through more benchmark sources, it seems the performance of .NET Core vs Mono may not be so one sided after all, but still looking better for .NET Core overall.
I found so far a minor issue with swift3 editor syntax color. When it is set initially - editor starts with plain white color. Workaround is to select swift and select swift3 back.
Hi, could you also add brainfuck language? Seriously it should be fun I think for puzzles but mostly for AI battles and contests, and quite simple to add on the platform