ZScreen is an open-source screen capture program that allows for region/window/full-screen screenshots. ZScreen can FTP screenshots and put the URL in your clipboard in a single keystroke. It supports automatic custom naming conventions with variables. ZScreen can also interface with image editing software. It is a C#.NET 2.0 program hosted on Sourceforge.net and built by BrandonZ (inf1ni).

Users can also optionally save images to either FTP or Clipboard. When saving to FTP the URL is copied into clipboard with a single keystroke so that a user may paste that link via irc, email, im, etc. There is a history section that stores the URL to every screenshot that has been uploaded so that a person may just copy and paste multiple URLs off to someone via a chat medium.
ZScreen uses custom automatic naming conventions with variables such as %mi to retrieve the current minute (or %t to get the title of the active window for instance) are supported. It also can interface with image editing software such as Microsoft Paint, Paint.NET or Adobe Photoshop so that editing may be done before a screenshot is uploaded, saved, or put in clipboard.
ZScreen features a very silent operation as it can just be set up once and then left alone. Everything that needs to be used regularly can be accessed from the right click menu. Three hotkeys (active window, cropped shot, and full screen) make it easy so that you do not need to unnecessarily open up the program window. Crop shots (region capture) can be captured and the URL given out to someone else in less steps then any other program in existence.
Here is the entire process of taking a crop shot with no steps left out. Press your hot key (control + shift + l for instance), click your left mouse button once and drag down and right, and release. Instanteously paste into a chat window (control + v for instance) and press enter.

ZScreen cam Capture:
1. Entire Screen
2. Active Window
3. Selected Window
4. Crop Shot
5. Last Crop Shot
6. Periodic Screenshots via Auto Capture
7. Clipboard Upload
8. Images from Drag & Drop Window
9. Screen Color via Screen Color Picker

The license of this software is Freeware, you can free download and free use this screen capture software.