Voila for Mac is a full-featured screenshot app
Posted Dec 22nd 2008 10:00AM by Lee Mathews
Yes, OSX's Grab tool is a good starting point, but I like to be able to crop, edit, add arrows and callouts, and perform other similar chores without having to launch something like Photoshop or GIMP.
Voila provides all the features I'm after. Apart from full screen, window, region, and menu capturing, it also offers an array of editing and notation functions. Arrows, callouts, shapes, and text are easy to add - and text can be edited after it's placed unlike a lot of similar applications. It also supports one-click exporting to iPhoto and Mail.
One glaring omission is resizing. It's something I use all the time, so its absence is a bit of an inconvenience.
The beta version is currently free, though the FAQ states that Voila will indeed become a commercial app. I'm just getting started on my Mac, so if you've got a better free alternative share it in the comments!