| Archivable.h | Provides the BArchivable interface |
| Autolock.h | Implements a handy locking utility |
| Beep.h | Functions to generate sounds from the computer |
| BlockCache.h | Implements a mechanism to store and retrieve memory blocks |
| BufferIO.h | Provides the BBufferIO class |
| DataIO.h | Defines abstract BDataIO and BPositionIO and the derived BMallocIO and BMemoryIO classes |
| Flattenable.h | Provides the BFlattenable interface |
| fs_interface.h | Provides an interface for file system modules |
| Handler.h | Provides the BHandler class |
| List.h | Defines the BList class |
| Locker.h | Provides locking class BLocker |
| Message.h | Provides the BMessage class |
| MessageFilter.h | Provides BMessageFilter class |
| Midi2Defs.h | |
| MidiConsumer.h | Defines consumer classes for the MIDI Kit |
| MidiEndpoint.h | Defines the Baseclass of all MIDI consumers and producers |
| MidiProducer.h | Defines producer classes for the MIDI Kit |
| MidiRoster.h | Defines the heart of the MIDI Kit: the MIDI Roster |
| parsedate.h | Date parsing functions |
| StopWatch.h | Provides the BStopWatch class |
| String.h | Defines the BString class and global operators and functions for handling strings |
| SupportDefs.h | Defines basic types and definitions for the Haiku API |
| syslog.h | System logging capabilities |
| TLS.h | Functions to use Thread Local Storage |
| TypeConstants.h | Represents typecodes that are used in various part of the Haiku API |
| USB3.h | Interface for the USB module |
| USB_spec.h | General definitions as defined by the USB standard |