Rick Allmendinger's Archive
Archive of programs written by Richard Allmendinger of Cornell University in Ithaca, New York. Includes a stereonet plotting program, a fault kinematics program, a microstructural analysis program, and several structural geology teaching programs.
https://www.rickallmendinger.net/
Nestor Cardozo's Archive
Archive of programs written by Nestor Cardozo. Programs are free for academics and include a structural geology calculator (OSXGeoCalc), a backstripping program (OSXBackstrip), a flexural modeling program (OSXFlex2D), a forward, 3D Trishear modeling program (Trishear3D), and a 2D and 3D inverse strain modeling program (SSPX).
http://www.ux.uis.no/~nestor/home.html
Rod Holcombe's Archive
This site contains programs written by Rod Holcombe at the Department of Earth Sciences at the University of Queensland in Australia. Software includes GEOrient (stereonets and rose diagrams), GeoCalculator (structural geometry calculator), GeoFryPlots (Fry strain analysis), and others.
https://www.holcombe.net.au/rod/
Fred Vollmer's Archive
This site contains several recent programs for analysis of spatial data (Orient), fabric and finite strain analysis (EllipseFit), time series analysis (Antevs), and organizing large collections of images (PicTracker).
http://www.frederickvollmer.com
MTEX
This is a free, open-source Matlab toolbox for analyzing and interpreting EBSD data.
https://mtex-toolbox.github.io/
Tools for geologic mapping and field-data collection
The following tools may be helpful for collecting field data and geologic map construction.
StraboSpot
https://strabospot.org/
Touch GIS
https://www.touchgis.app/
Field Move
https://www.petex.com/pe-geology/move-suite/digital-field-mapping/