| AccessError | Error accessing an indexed item. |
| Array | MetaClass for Falcon arrays. |
| BOM | Basic Object Model metaclass |
| Class | Metaclass of Class items. |
| ClassMethod | Metaclass of ClassMethod items. |
| CloneError | Item cannot be cloned. |
| CmdlineParser | Provides simple and powerful parsing of the command line options. |
| CodeError | VM and internal coded related error descriptor. |
| Continuation | Intra-context suspension and resume control device. |
| Dictionary | Metaclass for Falcon dictionary types. |
| Directory | Special iterator to access directory listings. |
| Error | Internal VM and runtime error reflection class. |
| FileStat | Class holding informations on system files. |
| Format | Controls the rendering of items into strings. |
| Function | Metaclass for Falcon function type. |
| GarbagePointer | Metaclass for internal and application-wide garbage sensible data. |
| GenericError | Generic undefined failure. |
| Integer | Integer type basic object model metaclass. |
| InterruptedError | Wait operation interrupted. |
| IoError | Error on I/O operations. |
| Iterator | Indirect pointer to sequences. |
| LateBinding | Metaclass for LateBinding type. |
| List | Fast growable double linked list. |
| MathError | Mathematical calculation error. |
| MemoryBuffer | Metaclass for MemBuf items. |
| MessageError | Error in the messaging system. |
| Method | Metaclass of method items. |
| Numeric | Generic number type basic object model metaclass. |
| Object | Object (class instance) type basic object model metaclass. |
| ParamError | Incongruent paremeter error. |
| ParseError | Generic input parsing error. |
| Path | Interface to local filesystem path definition. |
| Range | Metaclass for Falcon range type. |
| Semaphore | Simple coroutine synchronization device. |
| Sequence | Base abstract class for VM assisted sequences. |
| Set | Storage for uniquely defined items (and ordering criterion). |
| Stream | Stream oriented I/O class. |
| String | Metaclass for string items. |
| StringStream | Memory based stream. |
| SyntaxError | Syntax error descriptor. |
| Table | Home of tabular programming. |
| TableError | Error in Table class core operations. |
| TimeStamp | Representation of times in the system. |
| TimeZone | TimeZone enumeration and services. |
| Tokenizer | Simple stream-oriented parser for efficient basic recognition of incoming data. |
| TypeError | Type mismatch in a typed operation. |
| URI | Interface to RFC3986 Universal Resource Indicator. |
| VMSlot | VM Interface for message oriented programming operations. |