Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

CQXmppArchiveChat	Archived conversation as defined by XEP-0136: Message Archiving
CQXmppArchiveChatIq	Represents an archive chat as defined by XEP-0136: Message Archiving
CQXmppArchiveListIq	Represents an archive list as defined by XEP-0136: Message Archiving
CQXmppArchiveManager	Makes it possible to access message archives as defined by XEP-0136: Message Archiving
CQXmppArchiveMessage	Archived message as defined by XEP-0136: Message Archiving
CQXmppArchivePrefIq	Represents an archive preference IQ as defined by XEP-0136: Message Archiving
CQXmppArchiveRemoveIq	Represents an archive remove IQ as defined by XEP-0136: Message Archiving
CQXmppArchiveRetrieveIq	Represents an archive retrieve IQ as defined by XEP-0136: Message Archiving
CQXmppBindIq	IQ used for resource binding as defined by RFC 3921
CQXmppBookmarkConference	Bookmark for a conference room, as defined by XEP-0048: Bookmarks
CQXmppBookmarkManager	Allows you to store and retrieve bookmarks as defined by XEP-0048: Bookmarks
CQXmppBookmarkSet	The QXmppbookmarkSets class represents a set of bookmarks, as defined by XEP-0048: Bookmarks
CQXmppBookmarkUrl	Bookmark for a web page, as defined by XEP-0048: Bookmarks
CQXmppCall	Voice-Over-IP call to a remote party
CQXmppCallManager	Support for making and receiving voice calls
CQXmppClient	Main class for using QXmpp
CQXmppClientExtension	Base class for QXmppClient extensions
CQXmppConfiguration	Holds configuration options
▼CQXmppDataForm	Data form as defined by XEP-0004: Data Forms
CField	The QXmppDataForm::Field class represents a data form field as defined by XEP-0004: Data Forms
CMedia	The QXmppDataForm::Media class represents a media field as defined by XEP-0221: Data Forms Media Element
CQXmppDialback	Stanza used for the Server Dialback protocol as specified by XEP-0220: Server Dialback
CQXmppDiscoveryManager	Makes it possible to discover information about other entities as defined by XEP-0030: Service Discovery
CQXmppEntityTimeManager	Provided the functionality to get the local time of an entity as defined by XEP-0202: Entity Time
CQXmppExtendedAddress	Represents an extended address as defined by XEP-0033: Extended Stanza Addressing
CQXmppIceComponent	Piece of a media stream requiring a single transport address, as defined by RFC 5245 (Interactive Connectivity Establishment)
CQXmppIceConnection	Set of UDP sockets capable of performing Interactive Connectivity Establishment (RFC 5245)
CQXmppIncomingClient	Interface for password checkers
CQXmppIncomingServer	Incoming XMPP stream from an XMPP server
CQXmppInvokable
CQXmppIq	Base class for all IQs
CQXmppJingleCandidate	Transport candidate as specified by XEP-0176: Jingle ICE-UDP Transport Method
CQXmppJingleIq	IQ used for initiating media sessions as specified by XEP-0166: Jingle
CQXmppJinglePayloadType	Payload type as specified by XEP-0167: Jingle RTP Sessions and RFC 5245
CQXmppLoggable	Source of logging messages
CQXmppLogger	Sink for logging messages
CQXmppMessage	XMPP message
CQXmppMessageReceiptManager	Makes it possible to send and receive message delivery receipts as defined in XEP-0184: Message Delivery Receipts
CQXmppMucAdminIq	Chat room administration IQ as defined by XEP-0045: Multi-User Chat
CQXmppMucItem	Chat room "item"
CQXmppMucManager	Makes it possible to interact with multi-user chat rooms as defined by XEP-0045: Multi-User Chat
CQXmppMucOwnerIq	Chat room configuration IQ as defined by XEP-0045: Multi-User Chat
CQXmppMucRoom	Multi-user chat room as defined by XEP-0045: Multi-User Chat
CQXmppOutgoingClient	Outgoing XMPP stream to an XMPP server
CQXmppOutgoingServer	Outgoing XMPP stream to another XMPP server
CQXmppPasswordChecker	Abstract password checker
CQXmppPasswordReply	Password reply
CQXmppPasswordRequest	Password request
CQXmppPresence	XMPP presence stanza
CQXmppPubSubIq	IQ used for the publish-subscribe mechanisms defined by XEP-0060: Publish-Subscribe
CQXmppPubSubItem	Publish-subscribe item as defined by XEP-0060: Publish-Subscribe
CQXmppRegisterIq	Registration IQ as defined by XEP-0077: In-Band Registration
CQXmppResultSetQuery	Set element in a query as defined by XEP-0059: Result Set Management
CQXmppResultSetReply	Set element in a reply as defined by XEP-0059: Result Set Management
▼CQXmppRosterIq	Roster IQ
CItem	The QXmppRosterIq::Item class represents a roster entry
CQXmppRosterManager	Access to a connected client's roster
CQXmppRpcInvokeIq	IQ used to carry an RPC invocation as specified by XEP-0009: Jabber-RPC
CQXmppRpcManager	Make it possible to invoke remote methods and to expose local interfaces for remote procedure calls, as specified by XEP-0009: Jabber-RPC
CQXmppRpcResponseIq	IQ used to carry an RPC response as specified by XEP-0009: Jabber-RPC
CQXmppRtpAudioChannel	RTP audio channel to a remote party
CQXmppRtpVideoChannel	RTP video channel to a remote party
CQXmppServer	XMPP server
CQXmppServerExtension	Base class for QXmppServer extensions
CQXmppServerPlugin	Base class for QXmppServer plugins
CQXmppSessionIq	IQ used for session establishment as defined by RFC 3921
CQXmppSslServer	SSL-enabled TCP server
CQXmppStanza	Base class for all XMPP stanzas
CQXmppStream	Base class for all XMPP streams
CQXmppTransferJob	Single file transfer job
CQXmppTransferManager	Support for sending and receiving files
CQXmppUtils	Static utility functions
CQXmppVCardAddress	Represent a vCard address
CQXmppVCardEmail	Represents a vCard e-mail address
CQXmppVCardIq	Represents the XMPP vCard
CQXmppVCardManager	Gets/sets XMPP vCards. It is an implementation of XEP-0054: vcard-temp
CQXmppVCardOrganization	Represents organization information in XMPP vCards
CQXmppVCardPhone	Represents a vCard phone number
CQXmppVersionIq	IQ for conveying a software version as defined by XEP-0092: Software Version
CQXmppVersionManager	Makes it possible to request for the software version of an entity as defined by XEP-0092: Software Version
CQXmppVideoFrame	Representation of a frame of video data