Here are some plans, with materials listed, for making 4 LED IR clip:
http://n.camil.chez-alice.fr/index.php
For a TIR4-type software called Freetrack:
http://n.camil.chez-alice.fr/index.php
I read about on SimHQ here:
http://www.simhq.com/forum/ubbthreads.php?ubb=showflat&Number=2218532&page=1&fpart=1
I have not tried this software as I already have a TIR1 which still works just fine for me, but I may give it a try once Oleg's BoB is released with 6 DoF.