Synergy, the ShareMouse Alternative
Like ShareMouse, Synergy is software for sharing one mouse and one keyboard between multiple computers on a network. You can also copy and paste between your computers and drag and drop files between devices too. To save time, Synergy allows you to automatically configure.
As well as using SSL encryption to keep your data safe, this ShareMouse alternative supports Windows, Mac and Linux. You can also swap keys on controlled computers, such as the Mac command key and control key (in case you want to use control+C to copy on a Mac).