Eiciel allows you to visually edit file ACL entries. You can add and remove users and groups who will be granted permissions through the graphical interface. Eiciel can be used as stand-alone application and as Nautilus extension.
ACL:
http://bestbits.at
Eiciel:
http://rofi.roger-ferrer.org/eiciel/
Also-see:
http://www.cs.bham.ac.uk/~nrs/jfacl/ (Java-based UI)
I didn't see no package but I know it is in Fedora-extras, I just didn't want to rebuild it....