JShot is a free and multiplatform screen capture and uploader application which allows you to capture and annotate a part of your screen and share it via the Internet in one step. It lets you to upload screenshots to the Web or send to an Instant Messaging partner. JShot works on almost every operating system, no matter you are using Windows, Linux or Mac OS X. JShot is completely free to download and use for personal usage.
Capture a rectangular region, full screen or clipboard content
Capture active window, taskbar, deskop, widget (Windows only)
Upload via FTP, ImageShack, Skype, Twitter, Picasa
Drawing various shapes, adding text to the picture
Moving, resizing shapes and updating shape properties
System tray launcher
Context menu integration (Windows)
System wide keyboard shortcuts (Windows and Linux x86/x64)
Compatible with Windows, Linux, Solaris, Mac OS X, etc.
It is possible to extend the functionality of JShot by installing plugins.