This is an attempt to document the various XMPP Extensions (​XEPs) supported by XMPP protocol plugin in libpurple.

XEP	libpurple version	notes
​XEP-0004: Data forms	?
​XEP-0012: Last Activity	?
​XEP-0020: Feature Negotiation	?	(for file transfers)
​XEP-0030: Service Discovery	?
​XEP-0045: Multi-User Chat	?
​XEP-0050: Ad-Hoc Commands	?
​XEP-0054: vcard-temp	?
​XEP-0055: Jabber Search	?
​XEP-0060: Publish-Subscribe	?	(partial/minimal support, used for PEP)
​XEP-0065: SOCKS5 Bytestreams	?
​XEP-0066: Out of Band Data	?
​XEP-0071: XHTML-IM	?
​XEP-0077: In-Band Registration	?
​XEP-0084: User Avatar	?	Yes (older version)
​XEP-0085: Chat State Notifications	?
​XEP-0092: Software Version	?
​XEP-0095: Stream Initiation	?
​XEP-0096: File Transfer	?	(SOCKS5 bytestreams, but no ibb support)
​XEP-0107: User Mood	?
​XEP-0115: Entity Capabilities	?	(needs updating)
​XEP-0118: User Tune	?
​XEP-0153: vCard-Based Avatars	?
​XEP-0163: Personal Eventing Protocol	?
​XEP-0172: User Nickname	?
​XEP-0174: Serverless Messaging	?	(via the Bonjour prpl)
​XEP-0199: XMPP Ping	?
​XEP-0202: Entity Time	?
​XEP-0203: Delayed Delivery	?
​XEP-0224: Attention	?
​XEP-0231: Bits of Binary	?	(used for custom emoticons)
​XEP-0245: The /me Command	?
​XEP-0249: Direct MUC Invitations	?

(INCOMPLETE)