I'm trying to make a video by panning through cells in a webcomic. First I tried Kdenlive, but that seems to only support linear panning, so you can't do it smoothly. I found someone complaining about it that said Cinlerra can do it, but I downloaded and tried that out and the camera seems to stop at every waypoint. Is there software that lets me continuously and smoothly move the camera? Or if Cinlerra does it, can someone link me to something that says how?
Try HitFilm 3 Express. I believe that will do what you're looking for. HitFilm 3 Express
Natron does this. It is a pretty new open source node-based compositing software which is multi platform. The developers have been very quick to put something which is already impressive. If you know Nuke, you should get up and running pretty quickly.
Another compositing software which is free but not open source is Blackmagic Fusion. They bought eyeon Software in 2014 and now provide this amazing software for free.