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

XEP	notes
​XEP-0004: Data forms
​XEP-0012: Last Activity
​XEP-0020: Feature Negotiation	(for file transfers)
​XEP-0030: Service Discovery	(no UI implementation in Pidgin or Finch)
​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: SI 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)