I'm an account Manager at eXoPlatform.
GateIn is under LGPL, and eXo provide a range of modules under AGPL to include on top of GateIn : eXoDMS, eXoWCM, eXoWF, eXoKS, eXoCS, eXoSocial..
It would be a pleasure for me to reply to your questions and clarify to you our business model. Do not hesitate to contact me :
Email : email@example.com
Skype : fatma.ben.ghenaya
Fatma BEN GHENAYA