Hi Donald

There is no app performs what you need, but we can work around this to do what you need 

For 1): you can use odoo project module, every entity you are introducing the service to them is a project and each project contains tasks, and each task can be assigned to a contact not a user as you said they are not employees  -just small modification in the field "Assignment To" to include all contacts not only odoo users-

For 2): it is simple report can be extracted from tasks page to see what are the tasks assigned to whom and when and the status of the each task

For 3): It is simple report can be extracted from project module to see what are the projects and what are the tasks inside each project assigned to them 

Hope this could help you :)

Regards

Hazem