We have an example, fully operational system that we run, just so you can see what a system looks like, review the invoices, see the P&L, see the CRM fully working, see the project management and understand the Admin. It is more complicated than most people will need - but it shows most of the functions in operation, clearly.
FANTASTIC.
In our example site: www.IntranetManagers.co.uk you may logon as the Managing Director, and see everything:
User name: Adrian.blane Password: 4dr14n MD
User name: Elaine.figg Password: 3l41ne Tech Director
User name: Lynn.martin Password: LynnM4 Book-keeper
User name: Jack.keel Password: J4ckK3 programmer
User name: Petra.quinn Password: P3tr4Q programmer
https://intranetmanagers.co.uk/