AGICO software: for paleomagnetism, rock-magnetism, and magnetic anisotropy (PC) by AGICO
CryoMag software: Python program by Michael Wack (LMU Munich) to make manual measurements on 2G rock magnetometers and Spinner magnetometers (currently JR4 only, but could be adapted to newer machines easily). Link to publication.
Dave's code: paleomagnetic packages and code by David Heslop
FORCinel: FORC processing software (Mac/PC) by Richard Harrison (requires Igor Pro from Wavemetrics)