| Array | A list based Array |
| Base64 | Base64 encoder/decoder class |
| CallEndpoint | An abstract call endpoint |
| Channel | An abstract communication channel |
| Cipher | An abstract cipher |
| Client | Thread that runs the User Interface |
| ClientAccount | An account |
| ClientAccountList | A client account list |
| ClientChannel | Channel used by client programs |
| ClientContact | A client contact |
| ClientDriver | Base Driver with client specific functions |
| ClientLogic | Base class for all client logics |
| ClientResource | A client contact's resource |
| ClientSound | A sound file |
| Compressor | An abstract data (de)compressor |
| Configuration | Configuration file handling |
| DataBlock | A class that holds just a block of raw data |
| DataConsumer | |
| DataEndpoint | A data transfer endpoint capable of sending and/or receiving data |
| DataFormat | A Data format |
| DataNode | |
| DataSource | |
| DataTranslator | An unidirectional data translator (codec) |
| DebugEnabler | A holder for a debug level |
| Debugger | An object that logs messages on creation and destruction |
| DefaultLogic | The client's default logic |
| Driver | A Channel driver module |
| DurationUpdate | An UI time updater |
| Engine | Engine globals |
| EngineCheck | Engine checker interface |
| ExpEvaluator | An expression parser and evaluator |
| ExpExtender | ExpEvaluator extending interface |
| ExpOperation | A single operation in an expression |
| File | A stream file class |
| FormatInfo | |
| FormatRepository | A repository for media formats |
| GenObject | |
| GenPointer | Templated pointer that can be inserted in a list |
| HashList | A hashed object list class |
| ImageInfo | |
| ListIterator | Class used to iterate the items of a list |
| Lock | Ephemeral mutex or semaphore locking object |
| Lock2 | Ephemeral double mutex locking object |
| Lockable | Abstract interface for lockable objects |
| MD5 | A standard MD5 digest calculator |
| MemoryStream | A Stream that operates on DataBlocks in memory |
| Message | A message container class |
| MessageDispatcher | A message dispatching hub |
| MessageHandler | A message handler |
| MessageNotifier | Post-dispatching message hook |
| MessagePostHook | Post-dispatching message hook that can be added to a list |
| MessageReceiver | A multiple message receiver |
| MessageRelay | A message handler relay |
| MimeAuthLine | MIME authentication line |
| MimeBinaryBody | MIME for obscure binary data |
| MimeBody | Abstract MIME data holder |
| MimeHeaderLine | MIME header line |
| MimeLinesBody | MIME for multiple text lines |
| MimeMultipartBody | MIME multipart container |
| MimeSdpBody | MIME for application/sdp |
| MimeStringBody | MIME for one text string |
| Module | A Plugin that implements a module |
| MucRoom | An account's MUC room contact |
| MucRoomMember | A MUC room member |
| Mutex | Mutex support |
| MutexPool | A Mutex pool |
| NamedIterator | NamedList parameters iterator |
| NamedList | A named string container class |
| NamedPointer | A named pointer class |
| NamedString | A named string class |
| ObjList | An object list class |
| Plugin | Plugin support |
| RefObject | |
| RefPointer | Templated smart pointer class |
| RefPointerBase | Internal helper class |
| Regexp | A regexp matching class |
| Router | Call routing thread |
| Runnable | Encapsulates a runnable task |
| SctpSocket | Abstract SCTP Socket |
| Semaphore | Semaphore implementation |
| SHA1 | A standard SHA1 digest calculator |
| Socket | A generic socket class |
| SocketAddr | A socket address holder |
| SocketFilter | A filter for received socket data |
| Stream | An abstract stream class capable of reading and writing |
| String | A C-style string handling class |
| SysUsage | A class exposing system resources usage |
| TableEvaluator | An SQL-like table evaluator |
| Thread | Thread support class |
| ThreadedSource | Data source with own thread |
| Time | A time holding class |
| TokenDict | |
| TranslatorCaps | |
| TranslatorFactory | An unidirectional data translator (codec) |
| UIFactory | A static user interface creator |
| URI | Encapsulation for an URI |
| Window | An abstract user interface window |
1.5.6