Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
spacedesk - spacedesk expands the Windows desktop computer screen to other computers over the local area...
Synergy - Project management & accounting for AEC professionals
iDisplay - iDisplay is an app that turns a mobile device into a secondary desktop monitor. The app currently supports iOS, Android, Windows and MacOS, and it lets users connect a desktop computer to a mobile device over WiFi. Read more about iDisplay.
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.
TwomonUSB - You can create dual monitors quickly and easily using a USB.