ScreenTray - A better way to capture, annotate and share screenshots

Droplr - Droplr is a tiny application that aims at helping people share things easier.

KShare - The free and open source and cross platform screen sharing software

Nvidia ShadowPlay - ShadowPlay

Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.

ConnectWise Control - ConnectWise Control is a mobile app that allows you to instantly connect with another system from anywhere with a connection to the internet. The software not only comes in a mobile app, but it has a desktop version as well for complete coverage.