Software, all platforms

GeoShear, strain program by Chris Warren and Paul Karabinos at Williams College. Java, all platforms

University of Wisconsin's strain programs. Java, all platforms.

Frederic Vollmer's strain program EllipseFit, and Orient (plotting application).

Software, Mac OSX

Rich Allmendinger's Stereonet, Trishear-softwar, Fault kinematics program and more. Mac OSX + some for Windows.

Nestor Cardozo's Stereonet, trishear 3D software, strain programs, backstripping etc. for Mac OSX.
NB: NEW VERSION (1.8) OF OSXStereonet as of Jan 24 2012, with amazing 3D views, excellent for teaching purposes! 3D option is found under "View".

Software, Windows

Rod Holcombe's software for stereonet projections, strain and more. Windows only.