MaxiVista is a multi monitor software and turns any spare PC into a dual monitor for your primary PC. The Software KVM switch allows you to operate up to four PCs from one mouse and keyboard. The clipboard synchronisation allows easy data sharing.
Sharemouse allows you to share one mouse/keyboard with multiple Mac and Windows computers and can replace a KVM or USB switch. You can also drag& drop files and share the clipboard between computers for easy data transfer.