ShareMouse - With its easy setup and high level of versatility, ShareMouse is a great tool if you're looking to use a single mouse and keyboard across multiple computers.
TeamViewer - TeamViewer lets you establish a connection to any PC or server within just a few seconds.
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
AnyDesk - AnyDesk is the world's most comfortable remote desktop application. Access all your programs, documents and files from anywhere, without having to entrust your data to a cloud service.
Synergy - Cross-platform software for sharing your mouse and keyboard between multiple computers
join.me - Instant screen sharing. Instant Aha!