[dale386]

This looks interesting. They make all of their money on enterprise licenses and give out their software for free to end users.

Also, they're about to fix their firewall limitation:

"NoMachine Anywhere is the next piece of the puzzle. NoMachine Anywhere is a free service, which will be available to everyone, enabling people to connect to each other's computer behind routers and firewalls, without the need for knowing their IP address. Initially slated for end 2013, it has been moved to first quarter 2014." -from their website