TeamViewer - TeamViewer lets you establish a connection to any PC or server within just a few seconds.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
LogMeIn - LogMeIn gives you fast, easy remote access to your PC or Mac from your browser, desktop and mobile...
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
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.
Advanced IP Scanner - Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.