FreeSnap is a powerful, easy to use and free screen capture utility. Needless to say, if Grab or Shift-Cmd-3 or 4 works fine for you, you don’t need FreeSnap. For those who do, FreeSnap features unique, advanced and powerful tools for taking screen captures–or automating them. Featuring AppleScriptability, scaling, 10 different formats, global key combos, a completely invisible version and more, FreeSnap is the most powerful free screen capture tool for Mac OS X today.
Pros: Simple GUI, several screen capture options, several file format options, timer feature, resource-friendly.
Cons: Development has fallen behind and shows no sign of continuation.