Is XMPP open source?

Related questions

1. Why WhatsApp uses Erlang?
2. What protocol does chat use?
3. Is Facebook Messenger a VoIP?
4. What is XMPP for?
5. What is Xmpp in IoT?
6. Is WhatsApp a VoIP service?
7. What is essentials XMPP?
8. How does XMPP chat work?
9. What port does Xmpp use?
10. Is WhatsApp better than Skype?

Tags

1. #widely
2. #incredibly
3. #instant
4. #called
5. #under
6. #server
7. #openfire
8. #protocol
9. #messaging
10. #administer
11. #solid
12. #adopted
13. #offers
14. #security
15. #performance
16. #setup
17. #jabber
18. #apache
19. #licensed
20. #source
21. #license