Use One Mouse & Keyboard to Control Multiple Computers

If you have more than one computer and usually use them at the same time, it is more efficient to use the mouse & keyboard of one computer to control all the computers. Fortunately, there are several free softwares for you to do this.

ShareMouse is a freeware for personal use, which even allow you to share your mouse keyboard across Windows and Mac. And ShareMouse can do more than just share your mouse - you can also drag & drop files and share the clipboard (such as Ctrl+C/Ctrl+V content) between computers!

Official Site: http://www.keyboard-and-mouse-sharing.com

Mouse without Borders is another similar free program by Microsoft but only work with Windows. Using it you can also copy text or drag and drop files across computers.
Download: http://www.microsoft.com/en-us/download/details.aspx?id=35460