First of all let me declare that I know the people in the company I am recommending. I do not work for them but I do know them well.
The company is Qualsys and the product is EQMS (Electronic Quality Management System) and their website is
www.qualsys.co.uk
The software runs through a browser such as IE or FireFox so there is no local installation required and it can run as a server based application or as a web service which you can host or they will do it for you. The big advantage of the web service version is that you can access your files anywhere you have an Internet connection.
Licencing is done in a number of different ways as it suits the client best and it handles all major file formats including drawings such as Autocad.