Other Websites
Software
Peter Katreniak - K3
Carsten Arnholm - AVI Tools
Cor Berrevoets - Registax (http://aberrator.astronomy.net/registax/index.html - page no longer available)
Other imagers
Jan Timmermans (in memory of Jan; his website was http://www.firmament.tk)
Steve Chambers - the man with the mods
Etienne Bonduelle - Very good and TWIRGer to boot.