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yes, the whole vnc family (eg. tightvnc):

to access your machines through firewalls, you need something like 'nat2nat' (you can find related information under the term stun) or you add constant portforwarding on your router to the machine you want to control.
show/hide this revision's text 2 still to much win32 in my head...; added 274 characters in body

yes, ultravnc. especially with the nat-2-nat connector. kind of deluxe-edition in terms of effortwhole vnc family (eg. tightvnc):pchelpware

to access your machines through firewalls, you need something like 'nat2nat' or you add constant portforwarding on your router to the machine you want to control.
show/hide this revision's text 1

yes, ultravnc. especially with the nat-2-nat connector. kind of deluxe-edition in terms of effort: pchelpware.