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

XEP	Status	Notes
​XEP-0004: Data Forms	Final	Since at least 2.4.1
​XEP-0012: Last Activity	Final
​XEP-0020: Feature Negotiation	Draft	(for file transfers)
​XEP-0022: Message Events	Obsolete	Superseded by XEP-0085, support updated.
​XEP-0030: Service Discovery	Final	(no UI implementation in Finch)
​XEP-0038: Icon Styles	Deferred	For smileys. Standard seems abandoned? Last revised 2003.
​XEP-0045: Multi-User Chat	Draft
​XEP-0047: In-band Bytestreams (IBB)	Final	Since 2.6.0
​XEP-0050: Ad-Hoc Commands	Draft
​XEP-0054: vcard-temp	Active (Historical)
​XEP-0055: Jabber Search	Active (Historical)
​XEP-0060: Publish-Subscribe	Draft	(partial/minimal support, used for PEP)
​XEP-0065: SOCKS5 Bytestreams	Draft
​XEP-0066: Out of Band Data	Draft
​XEP-0071: XHTML-IM	Draft
​XEP-0077: In-Band Registration	Final
​XEP-0084: User Avatar	Draft	v1.1
​XEP-0085: Chat State Notifications	Final
​XEP-0091: Legacy Delayed Delivery	Obsolete	Deprecated in favour of XEP-203. Still around.
​XEP-0092: Software Version	Draft
​XEP-0095: Stream Initiation	Draft
​XEP-0096: SI File Transfer	Draft	(SOCKS5 bytestreams, IBB)
​XEP-0100: Gateway Interaction	Active	minimal support in Pidgin/Finch?
​XEP-0107: User Mood	Draft
​XEP-0115: Entity Capabilities	Draft	v1.5 since 2.6.0
​XEP-0118: User Tune	Draft
​XEP-0124: Bidirectional-streams Over Synchronous HTTP (BOSH)	Draft	Since 2.6.0
​XEP-0146: Remote Controlling Clients	Active	Since 2.2.1
​XEP-0153: vCard-Based Avatars	Active (Historical)
​XEP-0156: Discovering Alternate XMPP Connection Methods	Draft	partial support since 2.6.0 (for BOSH)
​XEP-0163: Personal Eventing Protocol	Draft
​XEP-0166: Jingle	Draft	Since 2.6.0
​XEP-0167: Jingle RTP Sessions	Draft	Since 2.6.0 when compiled with voice and video support
​XEP-0172: User Nickname	Draft
​XEP-0174: Serverless Messaging	Final	(via the Bonjour prpl)
​XEP-0176: Jingle ICE-UDP Transport Method	Draft	Since 2.6.0 when compiled with voice and video support
​XEP-0177: Jingle Raw-UDP Transport Method	Draft	Since 2.6.0 when compiled with voice and video support
​XEP-0191: Simple Communications Blocking	Draft	Since 2.5.4
​XEP-0199: XMPP Ping	Final
​XEP-0202: Entity Time	Final
​XEP-0203: Delayed Delivery	Final	Since 2.2.1
​XEP-0206: XMPP Over BOSH	Draft	Since 2.6.0
​XEP-0224: Attention	Draft	Started life as a Pidgin "buzz" extension in 2007, now an XEP :-)
​XEP-0231: Bits of Binary	Draft	Since 2.5.2, used for custom emoticons.
​XEP-0232: Software Information	Deferred	Intended to replace XEP-0092 using XEP-0115
​XEP-0237: Roster Versioning	Obsolete	Since 2.6.5. XEP now part of ​RFC-6121
​XEP-0245: The /me Command	Active	Since forever.
​XEP-0249: Direct MUC Invitations	Draft	Support added in 2.6.4
​XEP-0256: Last Activity in Presence	Draft	Since 2.6.0
​XEP-0264: Jingle Content Thumbnails	Experimental	Thumbnails disabled in XMPP since 2.7.2 until it gets Draft status.

(INCOMPLETE)