Many people will note that you don't need to be able to code to get involved with open source, but contributing code is obviously also a good thing. Helping with documentation, bug reports (submitting, helping track down, solving), or ancillary work are good ways to get involved beyond coding.

Opensource.com has some suggestions: http://opensource.com/life/14/1/get-involved-open-source-201...

GNU also has a page with ways people can help: https://gnu.org/help/help.html