I'm starting on a new application to manage sales leads and appointments. It will be written in my spare time so may take a few weeks, but it a nutshell it will allow you to store all your clients information and arrange site visits and follow up phone calls. I'll integrate it into OES within time, but OES wont be a requirement. Once complete I'll release it on this site, no license and free to manipulate.

Cheers
Ryan Partington