dnSpy is still continued by community members here:
Code:
https://github.com/dnSpyEx
I'd recommend checking out ILSpy as well now, it has been heavily updated since dnSpy came into existence. ILSpy's decompiler is, in my opinion, much better than dnSpy's currently as well. (dnSpy still has other features ILSpy doesn't have like a debugger etc. though.)