Hi Matthew, It's good to see this interest in PLOTS. A couple other open source (or nearly so) packages related to 3D mapping are: SURE (compatible with VisualSFM output): http://www.ifp.uni-stuttgart.de/publications/software/sure/index.en.html

Ecosynther: described here with links: http://ecosynth.org/profiles/blogs/ecosynther-v0-7

There was a nice overview of several (mostly proprietary) packages in this paper: http://www.ifp.uni-stuttgart.de/publications/phowo13/240Haala-new.pdf and a presentation here: http://www.ifp.uni-stuttgart.de/phowo/2013/presentations/240Haala.pdf

Thanks, Ned. Can't believe I forgot Ecosynther! that's one of the cooler ones.

That presentation is excellent in comparing the advantages of different solutions. Here were the software packages they looked at:

SocetSet, BAE Systems. UltraMap V 3.1, Microsoft. Match-T DSM 5.5, Trimbly/inpho. ImageStation, ISAE-Ext. GeoSystems. Astrium, PixelFactory. RMA DSM Tool, Royal Military Academy. Joanneum Research, Graz. MicMac, IGN France. SURE, Stuttgart University. DLR-SGM, German Aerospace Center.

It might be good to also note which if any of these programs will make orthophotos -- just autostitch air photos into map images without topographical information. I suspect some of them must because it has to be easier than sfm.

Chris, I pointed out that MicMac seems to be the only OS software with built-in orthorectification functionality, but there are some other options too:

There is a post on the ATOR blog (developers of python photogrammetry toolbox) on using GRASS to georectify point clouds. It LOOKS easy.

There is also a DIY Drones thread on this topic, and they mention the ATOR blog's PPT/GRASS workflow and MicMac as well. And also the free trial version of Pix4D Mapper

Also- Open Drone map

Also Autodesk Recap 360 and ReMake