There are several free or commercial variants or free fro propreitary mounts - I'm still experimenting myself.
AudeLA is free
http://www.audela.org/english_audela.php
PrecisionPEC is expensive and only for Paramount's
https://www.bisque.com/PPDL/default.asp
PECTool is free but only for Celestron mounts
http://www.celestron.com/c2/images/f...olinstall1.zip
PEC Utility Tool is free but only for Meade LX200GPS or RCX400 mounts
http://www.meade.com/support/auto/pectoolinst.zip
PEMPro is commerical, but requires a camera control program like MaximDL or AstroArt or CCDSoft5
http://www.ccdware.com/Files/PEMProV2-2.00.31.exe