If it is only to make a video with those rendered images then Virtualdub and Handbrake comes first to my mind.
Virtualdub is no longer developed i think but i will use it so long it works (do you know if someone develops this further?).
There are many plugins you can use with some basic editing capabilities. It is small, basic and very fast to work.
It does have some different version around(that i don't know about).
I use it to work very fast, to make AVI's then to open Sony Vegas.
If you want MPG4 files Handbrake is very nice.