Workflow Process Tracker

I am looking for a basic workflow process application to be written. The database tables are created, and primarily we are dealing with a simple concept. The user would log on to the site. They would be able to enter new projects and assign people to such projects. There is a set workflow that is constant, and the primary issue would be the display of the information in a user friendly format, easy to update the status of a project, and be able to do some basic calculations on the workflow (e.g. average # of days from step1 to step2, etc). This would be web based, so could be accessed from any web-enabled computer.