Word for one who likes to share knowledge when asked

Working in an organization where your coworkers like to share information and knowledge.

What can we call someone who likes to share knowledge when asked?

Solution 1:

forthcoming (ODO)

2.1 Willing to divulge information.
‘Of course doctors and receptionists should be forthcoming with this information.’
‘I immediately liked the fact that he was open and forthcoming.’

O'Neill, "User-Developer Cooperation in Software Development," p.198:

Users were very forthcoming with information, proposals, requests and so on, freely using the shared external models to frame and …