Apps similar to SnapCrab include ShareX, which is free and open source. Other options are Greenshot, Snipping Tool, PicPick and FastStone Capture. There's no shortage of Screenshot Capture Tools like SnapCrab, with more than 50 alternatives for Windows, Mac, the web, Linux and Android.
Capster helps you enhance your asynchronous communication with captures of your screen. Record your screen as you demonstrate a feature, idea, or bug, or take a screenshot and annotate it to better convey your point - and instantly share it through the cloud.
Fii is a completely free online sharing application which brings visualization to your online conversation. You can show your co-worker, friend, teacher, boss, parents or whomever you want a part of your screen with a single mouse click.
AeroShotCRE is an open source improved fork of AeroShot developed by Cvolton aimed for Crazy Error videos. Despite that it can be used as a regular window screenshotting tool.
You grab Screens or Windows using the standard PrtScn and Alt-PrntScn keys and MGrab will intercept the saved data as it is sent to the clipboard and put it into your chosen folder as a BMP or JPG file leaving the clipboard free for you to take another screenshot.
