Graphic Converter 4.9 came bundled with my Powerbook and even though I have Photoshop CS I couldn't live without it. Brilliant piece of software. Sadly, though it can open Flics, they can't be edited (they can, but they can't be saved as flics).
I think it's up to v5.6 these days but that version doesn't seem to be able to edit/export flics yet either. Oh well.
Can the GIMP handle them? I had a look on the Gimp site but couldn't find out anything about flics. I can't really justify a 50mb download just in case it does.