The oficial module is from the OCA
This module was written to extend crm features. It delivers new object named "Actions" to follow history around leads and opportunities. This new object depends on ACL groups you give to users.
To install this module, you just need to select the module and insure yourself dependencies are available.
No particular configuration to use this module except :
- potential customisation with type of actions,
- add allowed user in the ACL group