ShareX is a screenshot taking program that allows you to easily capture any active window or selected region and then perform several automatic post-capturing actions such as resizing, copying to clipboard or hard drive, uploading to various image hosting services and more.
You can take screen captures with different shapes such as ellipse, triangle, polygon etc. and also perform automatic capturing of full screen or only certain area.
There are a lot of post-capturing actions that can be performed automatically once they are checked, including adding watermarks, borders and shadows, image annotations and instantly uploading to Imgur, ImageShack, Flickr, Photobucket, Picasa and others.
As configuration options available, you can choose the image format (.png, .jpg, .gif, .bmp or .tiff), adjust JPG/GIF quality, set the size of border and shadow applied, make watermark customizations and more.
ShareX can also be used to upload files (to services like Dropbox, Google Drive, FTP, RapidShare and others) as well as clipboard content and then send the URLs by e-mail or post them on social networking services automatically.