Shutter is a feature-rich screenshot program. You can take a screenshot of a specific area, window, your whole screen, or even of a website - apply different effects to it, draw on it to highlight points, and then upload to an image hosting site, all within one window. Shutter is free, open-source, and licensed under GPL v3.
Shutter used to be called GScrot.
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Shutter is an open-source program, and is available completely for free!
If you like Shutter and find it useful, help keep it actively developed by clicking the donate button or sending me a gift from my Amazon wishlist.