Ok, it has been asked about enough to warrant me posting this so others interested in 3D Matchmoving may learn and benefit
NOTE: This thread is about 3rd party 3D Matchmoving software only.
If enough people show interest, I'll create a sticky talking about available 2D tracking solutions as well.
(i.e, Point Trackers - pretty much available in every compositor
...and Planar trackers available from Imagineer Systems.)
Ok, first I'll start with the best FREE ones out there: