Need to auto populate value based on the value of related field? For this requirement Auto Populate is the perfect solution. The advanced configuration tools allow you to clearly define what should happen whenever a related field value changes.
Other add-ons of interest
Glances - Integrate All Your Applications
Accomplish More Every Day. Spend your time on getting things done, not on finding information. Glances securely connects all of your apps and provides a simplified view of the data you need right when you need it, in real time.
At a glance, view high level summaries of all related data for a given record. For example, see how many contacts an account has or the total value of all quotes combined for a contact.