Pivotal tracker can work for this to some degree. Tho not custom built for your defined need. I would venture to guess there's a fair bit of functionality that

Pivotal tracker can work for this to some degree. Tho not custom built for your defined need. I would venture to guess there's a fair bit of functionality that lies under the iceberg tip and this is harder to nail one might expect. It would have to be exceptional imho to be something people would pay for vs using existing tools. However if done well ...certainly has potential.