Software for Projection Mapping

Projection Mapping can be done with various kinds of software. 
Here's an overview of a couple (let us know if we're missing any)

Software	Short description	Video mapping tutorial	Licensing
After Effects	Old school Mapping!!		part of the creative cloud
Resolume	Resolume Arena is a VJ tool with built in excellent Projection Mapping software.		Free (with watermark)/Dongle
Isadora: Izzy Map	IzzyMap  offers interactive control of mapping attributes, allowing real-time motion graphics to become part of your design. By taking control of these parameters during your show, slices and masking can be layered and composited within each instance of IzzyMap, and multiple instances of IzzyMap allow your mappings to be layered and combined in endless ways.		Free (no saving)/Dongle
Touchdesigner	Various projection mapping tools, 2D & 3D.		Free (limited resolution)
Madmapper
Blender			Free
VPT	Video Projection Tool (VPT) is a free multipurpose realtime projection software tool.		Free

Other software for mapping for specific video mapping purposes

Arkaos

Heavy M

WatchOut

Disguise

MappingMatter

ScalableDisplay

Mapio2

Millumin