This is an attempt to document the various XMPP Extensions ([http://xmpp.org/extensions/ XEPs]) supported by XMPP protocol plugin in libpurple.

|| XEP || notes ||
|| [http://xmpp.org/extensions/xep-0004.html XEP-0004]: Data forms || ||
|| [http://xmpp.org/extensions/xep-0012.html XEP-0012]: Last Activity || ||
|| [http://xmpp.org/extensions/xep-0020.html XEP-0020]: Feature Negotiation || (for file transfers) ||
|| [http://xmpp.org/extensions/xep-0030.html XEP-0030]: Service Discovery || (no UI implementation in Pidgin or Finch) ||
|| [http://xmpp.org/extensions/xep-0045.html XEP-0045]: Multi-User Chat || ||
|| [http://xmpp.org/extensions/xep-0047.html XEP-0047]: In-band Bytestreams (IBB) || ||
|| [http://xmpp.org/extensions/xep-0050.html XEP-0050]: Ad-Hoc Commands || ||
|| [http://xmpp.org/extensions/xep-0054.html XEP-0054]: vcard-temp || ||
|| [http://xmpp.org/extensions/xep-0055.html XEP-0055]: Jabber Search || ||
|| [http://xmpp.org/extensions/xep-0060.html XEP-0060]: Publish-Subscribe || (partial/minimal support, used for PEP) ||
|| [http://xmpp.org/extensions/xep-0065.html XEP-0065]: SOCKS5 Bytestreams || ||
|| [http://xmpp.org/extensions/xep-0066.html XEP-0066]: Out of Band Data || ||
|| [http://xmpp.org/extensions/xep-0071.html XEP-0071]: XHTML-IM || ||
|| [http://xmpp.org/extensions/xep-0077.html XEP-0077]: In-Band Registration || ||
|| [http://xmpp.org/extensions/xep-0084.html XEP-0084]: User Avatar || v1.1 (grok received notifications with v0.12 namespace) ||
|| [http://xmpp.org/extensions/xep-0085.html XEP-0085]: Chat State Notifications || ||
|| [http://xmpp.org/extensions/xep-0092.html XEP-0092]: Software Version || ||
|| [http://xmpp.org/extensions/xep-0095.html XEP-0095]: Stream Initiation || ||
|| [http://xmpp.org/extensions/xep-0096.html XEP-0096]: SI File Transfer || (SOCKS5 bytestreams, IBB) ||
|| [http://xmpp.org/extensions/xep-0100.html XEP-0100]: Gateway Interaction || minimal support in Pidgin/Finch ||
|| [http://xmpp.org/extensions/xep-0107.html XEP-0107]: User Mood || ||
|| [http://xmpp.org/extensions/xep-0115.html XEP-0115]: Entity Capabilities || v1.5 since 2.6.0 ||
|| [http://xmpp.org/extensions/xep-0118.html XEP-0118]: User Tune || ||
|| [http://xmpp.org/extensions/xep-0124.html XEP-0124]: Bidirectional-streams Over Synchronous HTTP (BOSH) || Since 2.6.0 ||
|| [http://xmpp.org/extensions/xep-0153.html XEP-0153]: vCard-Based Avatars || ||
|| [http://xmpp.org/extensions/xep-0153.html XEP-0156]: Discovering Alternate XMPP Connection Methods || partial support since 2.6.0 (for BOSH) ||
|| [http://xmpp.org/extensions/xep-0163.html XEP-0163]: Personal Eventing Protocol || ||
|| [http://xmpp.org/extensions/xep-0166.html XEP-0166]: Jingle || Since 2.6.0  ||
|| [http://xmpp.org/extensions/xep-0167.html XEP-0167]: Jingle RTP Sessions || Since 2.6.0 when compiled with voice and video support ||
|| [http://xmpp.org/extensions/xep-0172.html XEP-0172]: User Nickname || ||
|| [http://xmpp.org/extensions/xep-0174.html XEP-0174]: Serverless Messaging || (via the Bonjour prpl) ||
|| [http://xmpp.org/extensions/xep-0176.html XEP-0176]: Jingle ICE-UDP Transport Method || Since 2.6.0 when compiled with voice and video support ||
|| [http://xmpp.org/extensions/xep-0177.html XEP-0177]: Jingle Raw-UDP Transport Method || Since 2.6.0 when compiled with voice and video support ||
|| [http://xmpp.org/extensions/xep-0191.html XEP-0191]: Simple Communications Blocking || Partial ||
|| [http://xmpp.org/extensions/xep-0199.html XEP-0199]: XMPP Ping || ||
|| [http://xmpp.org/extensions/xep-0202.html XEP-0202]: Entity Time || ||
|| [http://xmpp.org/extensions/xep-0203.html XEP-0203]: Delayed Delivery || ||
|| [http://xmpp.org/extensions/xep-0206.html XEP-0206]: XMPP Over BOSH || Since 2.6.0 ||
|| [http://xmpp.org/extensions/xep-0224.html XEP-0224]: Attention || ||
|| [http://xmpp.org/extensions/xep-0231.html XEP-0231]: Bits of Binary || (used for custom emoticons) ||
|| [http://xmpp.org/extensions/xep-0232.html XEP-0232]: Software Information || ||
|| [http://xmpp.org/extensions/xep-0245.html XEP-0245]: The /me Command || ||
|| [http://xmpp.org/extensions/xep-0249.html XEP-0249]: Direct MUC Invitations || ||
|| [http://xmpp.org/extensions/xep-0256.html XEP-0256]: Last Activity in Presence || Since 2.6.0 ||

(INCOMPLETE)