Synergy - Cross-platform software for sharing your mouse and keyboard between multiple computers
DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
Barrier - Barrier is a cross-platform software for sharing your mouse and keyboard between multiple computers...
Preme for Windows - Speeds up your window switching.
Input Director - Control multiple windows systems with one keyboard/mouse. Share a keyboard and mouse across multiple windows system.
GridMove - GridMove - A window management tool that can quickly arrange your windows into desktop grids.