I use Cara - Professional. It's cheaper than all the other professional programmes - Still expensive though and easy to use. See
www.miccant.co.uk.
However I would like to say that unless you know how to use Kent's rep thoroughly i.e. you have studied homeopathy at college, any computer programme will be impossible to use as you won't know the language in which to search!!
GM says you need 10 years experience using a rep the ordinary way before you use a computer programme. I wish I could afford to buy more MM's for the computer programme like Scholtan, Sankaran, Sherr and Veumoulen as I could then do a seach for rubtics using these. I do have the books though!!