Looking for free bussiness alternatives to TeamViewer

What is free or low cost remote support tools do you know ?
Need used it for business, startup project.

I found VNC, ultravnc, but it not so easy to use.

Very good is LiteManager, but it is free only for up to 30 PC. (low cost solution)

Do you know another one ?

VNC is probably going to be the best option as far as being free. I would setup reverse VNC, this makes it easier to connect when the end user is behind a NAT router RealVNC | Starting Listening VNC Viewer and establishing a reverse connection
Looks good, something like my own TeamViewer I found in LiteManager
configure private ID router (NOIP)

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