[progman]

Developers who like Python syntax and want C performance should seriously consider Nim.

http://nim-lang.org

[weberc2]

What's the library story for Nim? Sincere question; not trying to start a flame war.

[dagw]

http://nim-lang.org/docs/lib.html

However many of the libraries list under "third party" are either unmaintained or not really ready for production. The stuff in the standard library seems pretty good though (although I've not used Nim for serious production work)