Jreen — Free and Opensource Jabber library, written in C++ using cross-platform framework Qt. Licensed under the GNU/GPL version 2. First stable version 1.0.0 was released on November 10, 2011.

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Advantages over other Jabber/XMPP libraries:

• Easy to extend architecture
• Easy to learn and support
• Very fast

Version	Release date	Changelog	Download
1.0.0	10 November 2011	First stable public release.	Download
1.0.1	13 November 2011	Fixed segfault at SASL initialization Fixed Facebook support	Download
1.0.2	12 March 2012	Added support for ProxyFactory Added immunity to invalid stanzas Added localization support for incoming stanzas Fixed QJDns initialization behaviour	Download
1.0.3	14 March 2012	Added Logger implementation Fixed QJDns initialization issue	Download
1.0.4	28 March 2012	Added support for in-band registration Added ability to force/deny compression/encryption Added CAPTCHA support Fixed IQ requests to yourself Fixed handling of messages' types in MessageSession	Download
1.0.5	29 March 2012	Fixed parsing of message's thread attribute	Download
1.0.6	8 April 2012	Fixed parsing of PubSub payload Fixed serializing of PubSub payload	Download
1.1.0	15 April 2012	Added PGP payloads Added support for Message Forwarding Added MetaContacts support Added experimental Jingle support Fixed authorization with SCRAM-SHA1 Fixed sending of IQ's on connect	Download

Jreen supports very huge pack of XEP's:

• RFC 6120: XMPP Core
• RFC 6121: XMPP IM
• RFC 6122: Address Format
• XEP-0004: Data Forms
• XEP-0016: Privacy Lists
• XEP-0030: Service Discovery
• XEP-0045: Multi-User Chat
• XEP-0048: Bookmarks
• XEP-0049: Private XML Storage
• XEP-0054: vcard-temp
• XEP-0060: Publish-Subscribe
• XEP-0077: In-Band Registration
• XEP-0082: XMPP Date and Time Profiles
• XEP-0085: Chat State Notifications
• XEP-0092: Software Version
• XEP-0107: User Mood
• XEP-0108: User Activity
• XEP-0115: Entity Capabilities
• XEP-0118: User Tune
• XEP-0124: Bidirectional-streams Over Synchronous HTTP (BOSH)
• XEP-0126: Invisibility
• XEP-0128: Service Discovery Extensions
• XEP-0138: Stream Compression
• XEP-0153: vCard-Based Avatars
• XEP-0158: CAPTCHA Forms
• XEP-0163: Personal Eventing Protocol
• XEP-0166: Jingle
• XEP-0167: Jingle RTP Sessions
• XEP-0172: User Nickname
• XEP-0176: Jingle ICE-UDP Transport Method
• XEP-0184: Message Delivery Receipts
• XEP-0199: XMPP Ping
• XEP-0202: Entity Time
• XEP-0203: Delayed Delivery
• XEP-0221: Data Forms Media Element
• XEP-0231: Bits of Binary
• XEP-0232: Software Information
• XEP-0242: XMPP Client Compliance 2009
• XEP-0245: The /me Command
• XEP-0266: Codecs for Jingle Audio
• XEP-0270: XMPP Compliance Suites 2010

Currently there are two projects using Jreen:

Tomahawk — The social media player

qutIM