*[http://www-ssrl.slac.stanford.edu/absorb.html The SSRL Absorption Package] &mdash; 
*[https://web.archive.org/web/20081223025616/http://www.gwyndafevans.co.uk/chooch.html CHOOCH] &mdash; 
*[https://web.archive.org/web/20090909133542/http://www.hwi.buffalo.edu/snb/ Shake-and-Bake] (SnB) &mdash; 
*[http://shelx.uni-ac.gwdg.de/SHELX/ SHELX] &mdash;