I really like Showgirls for photo editing nowadays.
I wasn't a fan of it at first sight (because compared to Geeqie/Gimp), but after a closer look, I realised, that it is a great program and it is more than enough for some photo improvement tasks.

There are still some points where it could be improved:
- Unlimited undo. (This is the biggest shortcoming)
- Cmd-M shortcut is reserved by Ambient.
- There are some bugs/missing implementations: At the Crop part, the lock doesn't work in manual mode; The program gets frozen after deleting some pictures.
- Some other shortcuts could be also nice: File deletion, renaming (Second biggest shortcoming), image auto rotation based on Exif info on/off.
- A slightly more complet Exif info also would be welcomed.


Ed:
And one more improvement offer: It could be really nice to edit Levels on a histogram.

[ Edited by dekanyz 05.12.2013 - 09:17 ]