ShareX is an advanced screenshotting, editing, and uploading tool. The program contains a plethora of screenshot types, tools, and settings. You can customize almost anything in the settings. ShareX contains many preconfigured uploaders such as imgur and allows you to create your own. The program is not only...
ProFree and open source
ProAllows uploading to a vast number of different services
ProCapturing (screen, video, a window, etc.) with annotation + automation
ProFreezes screen when you capture
ProCan capture video too
ProHas an editor
Nick (145 karma) recommendsReQtest Screen Capture
Nice settings to allow you to save all screen shots off to a folder. Can open them in a nice tool that's like a Paint but more powerful. Easiest work flow and customization of the 5 tools I've tired for screen capture on Windows, and it's free for personal use!
ProIntuitive image editor
ProIncludes many other useful tools
ProHas a portable version
ProMany options to configure how the screenshot is done
ProFree for personal use