Current G-Code listing
I , and others I think, would benefit from a searchable listing of active G-codes that is kept up to date as they are added or modified. The RepRap G-code Wiki ( http://reprap.org/wiki/G-code ) is a pretty good model but is difficult for practical use as it is not specific to Repetier. Codes are added from time to time ( example the recent addition of G2/G3 ) and could be easily missed by a user.
Comments
Or you might already have an extracted firmware directory with those files if it came with your printer on some type of media.