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Strain rates are usually output by geodetic GPS geodetic programs like GAMIT. I am not sure which software you used to process your data but usually the software will have a module to output strain rates.

https://sourceforge.net/projects/geostrain/

Article GeoStrain: An open source software for calculating crustal s...

StrainTool: https://github.com/DSOlab/StrainTool/tree/v1.0-beta4.0

Strain Calculator of cronin, 2012. It is both excel and matlab based.

http://scec.ess.ucla.edu/~zshen/visr/visr.html

https://www.induced.pl/software/msatsi

https://github.com/carltape

https://github.com/DSOlab

https://github.com/crowellbw

https://github.com/demanasta

http://peterbird.name/oldFTP/NeoKinema/

http://peterbird.name/publications/2009_GCN_orogen/2009_GCN_orogen.htm

I don't know of any..in need if it too

you can use the free software of Geostrain .thanks