TeamViewer - TeamViewer lets you establish a connection to any PC or server within just a few seconds.
mRemoteNG - mRemoteNG is a fork of mRemote, an open source, tabbed, multi-protocol, remote connections manager.
LogMeIn - LogMeIn gives you fast, easy remote access to your PC or Mac from your browser, desktop and mobile...
join.me - Instant screen sharing. Instant Aha!
Bomgar - Access any remote desktop, server, or POS system through firewalls - no VPN! Bomgar supports Windows, Mac, Linux, iPad, iPhone, and Android. Appliance or Cloud deployment options.
Chrome Remote Desktop - The easy way to remotely connect with your home or work computer, or share your screen with others.