I think what OP had in mind was a system that lets the job seeker track what was communicated and sent to a certain company. This is an awesome idea for many reasons: You could track which companies are notorious for failing to provide feedback to job seekers (even negative ones) or even shed light on which ones take ages to respond. It would be awesome to have a transparent infrastructure in place that is cloud based, open source, free, tracks these feedbacks in an "open/transparent" manner. I dislike the idea of tying into gmail (or facebook or google or other third party walled garden systems) though. I'd be happy to help on the technical side with requirements, use-cases and maybe even some funding.
Disclosure: one of my current companies works in recruitment but I have a SW development & infosec background. My profile has my contact details if interested.
I suppose you could automate the data update process to the extent that commercial ATS vendors are willing to link up with your system via API. There are even job boards that send notifications when someone views your application, though as a candidate I'm not actually sure whether that makes me more or less concerned about not getting an email back from them...
Lets say you applied at Google/FB/Apple/30 Start Ups.
You have issues remembering all of the statuses of the applications, as trying to remember 30+ jobs is hard. Follow ups, Emails, Stages, Interesting Links you found on their recruiting process, To Dos, Resume Version sent (if you applied to couple of positions and highlighted different skills). Point of Contact, Last contact. List of contacts.
Report page showing companies with most interactions.
Offer page showing offers you have received and comparing them.
having a system like this gives you a massive amount of data which has immense value for visitors/users (and you as a company). Big players who are notoriously slow / lazy / arrogant in their feedback would get a real kick in their behind. The same with shady recruiters who are spoiling it for the few good ones.