How to interact with the Free Software Community
People / Groups involved

Really depends on size of projects
Small projects often a one-man show
Bigger project have groups / subgroups
Common Terms / Definitions
Maintainer
The person who formally maintains a project
Core Team / Steering Committee
A group of skilled developers who make important decisions
Subsystem Maintainer
Somebody who is responsible for a particular sub-project
Developer Community
All developers involved with a project
User Community
Users of the software who often share their experience with others