Free downloadable software

DEM generation, created by Intermap Technologies
Modeling software, from Visual Computing Lab - CNR Pisa, Italy
Learning Digital Photogrammetry, created by J. Hoehle, Aalborg University, Denmark
PhoX, Photogrammetric Calculation System, a PhoX is a powerful measurement and analysis program for photogrammetric tasks (Gold Award in Prague 2016)
WinASEAN, a software for remote sensing data analysis
GreasePad, interactive geometric reasoning for freehand drawing, suitable to create line drawings, to trace outlines, and to study closure theorems.

CloudCompare, 3D point cloud and mesh processing software.
Computer Vison Source Code
Dragon , is a high-quality, commercial-grade, free remote sensing image processing software to schools and universities. However, everyone is welcome to download and use this software.
Free geodetic software developed by NGS, National Geodetic Survey of US
FullAnalyze , is an open source software for handling, processing and visualizing topographic lidar data (point clouds and waveforms).
GRASS GIS, an open source free Geographical Information System
QGIS - A Free and Open Source Geographic Information System
SPRING - GIS and remote sensing image processing system, from INPE, Brasil
TerraLib - GIS classes and functions library, from INPE, Brasil
3DVEM-Viewer, Editor & Meter (Beta) , to manage point clouds and photorealistic 3D models. Developed by GIFLE at UPV.
More software can be found here: Free Open Source Photogrammetry Foundation (FOSPHO)

TreesVis, a powerful processing, analysing and visualisation software for LIDAR laserscanning data
3DVEM - Register is a low-cost LiDAR software that outperforms the indirect registration, also known as alignment or relative orientation, of point clouds, point clouds and 3D models, as well as 3D models, based on targets/spheres/3D points. Developed by GIFLE at UPV.