Rukovoditel Demo | Free Project Management System We created some test projects/tasks/tickets etc. and added several users with different users right: Rukovoditel - Free Project Management Software
Free web-based open-source project management tool suitable for a small team

Rukovoditel Demo

We created some test projects/tasks/tickets etc. and added several users with different users right:

Standard version

View Demo

Note: Attachments don’t work in demo version. Original demo data refresh each hour.

Administrator (have full access)
Username: admin
Password: admin

Client (can view only his projects and have access to tickets)
Username: client
Password: client

Since the data is automatically refresh you probably will see errors in demo version while working in it.  
I recommend installing the project to your server to learn it.