If I were not using C R M from Buffini and Company - Referral Maker - PRO, I would have perhaps used this customer relationship management software.
Goes without saying they are robust and offers so many features for you to stay connected with your clients.
Not to mention they are pretty competitive, too.
Most of the time, they will offer you about 8 to 10 weeks of free trial. If you use the trial version, it is very likely you will stick to it.
Worth trying.