An incomplete family tree of Forth implementations and standards.

The initial data was based on this:

  http://www.complang.tuwien.ac.at/forth/family-tree/

This tree tries to show general relationships based on both direct
lineage and influences. It does not imply that any of these derive
from the sources of the parents.

Forth ====> Forth-77 ====> Forth-78 ====> Forth-79 ====> Forth-83 ====> ANS Forth
|                          |              |              |              |
+-> STOIC                  +-> FysForth   +-> Forth-64   |              +-> MAF
|   |                      |   |          |              |              |
|   +-> LSE                |   |          +-> MVP-Forth  +-----------+  +-> PFE
|   |                      |   |          |   |                      |  |
|   +-> MAGIC/L            |   |          |   +-> Super Forth 64     |  +-> FICL
|                          |   |          |                          |  |
+-> miniForth              |   |          +-> C64 FORTH/79           |  +-> pForth
|   |                      |   |          |                          |  |
|   +----> microFORTH      |   |          +-> Forth (Cargile&Reily)  |  |
|   |   |          |       |   +-------+      ^                      +--)---> F83
|   |   |          |       v           |      |                      |  |     ^ |
|   |   +----------)-----> figFORTH    |      |                      |  |     | +-> F83Y
|   |              |       |           |      |                      |  |     |     |
|   |              |       +-----------)------+----------------------)--)-----+     +-> ZF
|   |              |       |           |                             |  |           |
|   |              |       |           v                             |  |           |
|   |              |       |           tForth                        |  |           |
|   |              |       |           ^  |                          |  |           |
|   |              |       |           |  +-> iForth <---------------)--+-----------)------------------------------------------+
|   |              |       |           |      |                      |  |           |                                          |
|   |              |       |           |      +-> mxForth            |  |           |                                          |
|   |              |       |           |                             |  |           |                                          |
|   |              |       +-> Aackosoft FIG-Forth                   |  |           +-> F-PC                                   |
|   |              |       |                                         |  |               |                                      |
|   |              |       +-> WorkForth ----------------------------)--)---+           +-> TCOM                               |
|   |              |       |                                         |  |   |           |                                      |
|   +-> polyFORTH  |       +-> VolksForth <--------------------------+  |   |           |                                      |
|   |   |          |       |   |                                     |  |   +-----------)----+    +-> LMI PC/Forth             |
|   |   |          |       |   +-> deltaFORTH                        |  |               |    |    |   |                        |
|   |   |          |       |   |                                     +--)---------------)----)----+   +-> LMI Metacompilers    |
|   |   |          |       |   +-> TurboForth                        |  |               |    |    |   |                        |
|   |   |          |       |       |                                 |  |               |    |    |   +-> LMI UR/Forth         |
|   |   |          |       |       +-> BigForth <--------------------)--+               +-+  |    |       |                    |
|   |   |          |       |           |                             |  |                 |  |    |       +-> kForth <---------+
|   |   |          |       |           +-> Gforth                    +--)-> MARC4 qForth  |  +----)---+                        |
|   |   |          |       |                                         |  |                 |       |   |  +---------------------+
|   |   |          |       |                                         +--)-> ATLAST        |       |   |  |
|   |   |          |       |                                         |  |                 |       |   v  v
|   |   |          |       |                                         |  |                 |       +-> PowerForth
|   |   |          |       +-> MultiForth                            +--)-> Master Forth  |           |
|   |   |          |       |    |                                    |  |                 |           +-> ProForth for DOS
|   |   |          |       |    +-> MacForth                         +--)-> Blazin' Forth |           |   |
|   |   |          |       |        |                                |  |                 |           |   +-> ProForth for Windows
|   |   |          |       |        +-> MacForth+                    +--)-> kkForth       |           |       |
|   |   |          |       |            |                            |  |               +-+           |       +-> VFX Forth for Windows
|   |   |          |       |            +-> PowerMacForth <----------)--+               |             |       |    ^
|   |   |          |       |                |                        |  |               |             |       |    |
|   |   |          |       |                |                        |  |               |             |       +----)--> VFX Cross Compilers
|   |   |          |       |                +-> Carbon MacForth      |  |               |             |            |    ^
|   |   |          |       |                                         |  |               |             |            |    |
|   |   |          |       |                                         |  |               |             +-> GemForth |    |
|   |   |          |       |                                         |  |               |                          |    |
|   |   |          |       |                                         |  +---------------)-> Open Firmware          |    |
|   |   |          |       +-> Sixty FORTH                           |  |               |                          |    |
|   |   |          |       |                                         |  +---------------)-> Dragon FORTH           |    |
|   |   |          |       +-> White Lightning                       |  |               |                          |    |
|   |   |          |       |                                         +--)-> Forth-64    +--+                       |    |
|   |   |          |       +-> Enhanced FORTH                        |  |                  |                       |    |
|   |   |          |       |                                         +--)--> Modular Forth |                       |    |
|   |   |          |       +-> geoFORTH                                 |                  |                       |    |
|   |   |          |       |                                            |               +--+                       |    |
|   |   |          |       +-> Talbot tFORTH                            |               |                          |    |
|   |   |          |       |                                            |               |                          |    |
|   |   |          |       +-> popFORTH                                 |               |                          |    |
|   |   |          |       |   |                                        |               |                          |    |
|   |   |          |       |   +-> comFORTH <---------------------------+               |                          |    |
|   |   |          |       |                                            |               |                          |    |
|   |   |          |       +-> Tiny FORTH-64                            |               |                          |    |
|   |   |          |       |                                            |               |                          |    |
|   |   |          |       +-> Tri FORTH                                |               |                          |    |
|   |   |          |       |                                            |               |                          |    |
|   |   |          |       +-> VIC Forth                                |               |                          |    |
|   |   |          |                                                    |               |                          |    |
|   |   +----------)------------------------------> SwiftForth <--------+               |                          |    |
|   |   |          |                                    |               |               |                          |    |
|   |   |          v                                    |               |               |                          |    |
|   |   +-> chipFORTH                                   +-> SwiftX      |               |                          |    |
|   |       |                                               ^  |        |               |                          |    |
|   |       |                                               |  +-> T4   |               |                          |    |
|   |       +-----------------------------------------------+           |               |                          |    |
|   |                                                                   |               |                          |    |
|   +-> cmForth                                                         |               |                          |    |
|       |                                                               |               |                          |    |
|       +-> PilotForth <------------------------------------------------+               |                          |    |
|       |   |                                                           |               |                          |    |
|       |   +-> Quartus Forth                                           |               |                          |    |
|       |                                                               |               |                          |    |
|       +-> 4IM <---+                                                   |               |                          |    |
|       |           |                                                   |               |                          |    |
|       +-> Pygmy   |                                                   |               |                          |    |
|       |   |       |                                                   |               |                          |    |
|       |   +-------+                                                   |               |                          |    |
|       |                                                               |               |                          |    |
|       +-> Retro <-+                                                   |               |                          |    |
|           |       |                                                   |               |                          |    |
|           +-------)--> Reva                                           |               |                          |    |
|                   |                                                   |               |                          |    |
+-> eForth          |                                                   |               |                          |    |
|   |               |                                                   |               |                          |    |
|   +-> hForth <----(---------------------------------------------------+               |                          |    |
|                   |                                                   |               |                          |    |
+-> colorForth      |                                                   |               |                          |    |
|   |               |                                                   |               |                          |    |
|   +---------------+                                                   |               |                          |    |
|   |                                                                   |               |                          |    |
|   +-> ArrayForth                                                      |               |                          |    |
|                                                                       |  +------------+                          |    |
+-> Neon <--------------------------+                                   |  |                                       |    |
    |                               |                                   v  v                                       |    |
    +-> Yerk -----------------------)---+-----------------------------> Win32Forth                                 |    |
    |                               |   |                                                                          |    |
    +-> Mops -> PowerMops -> iMops  |   |                                                                          |    |
                                    |   |                                                                          |    |
Smalltalk --------------------------+   |                                                                          |    |
                                        |                                                                          |    |
ANSI C -----------------------------+   v                                                                          |    |
                                    |-> SENDIT                                                                     |    |
UCSD Pascal ------------------------+   |                                                                          |    |
                                        +--------------------------------------------------------------------------+    |
                                        |                                                                               |
                                        +-> Practical                                                                   |
                                        |   |                                                                           |
                                        |   +---------------------------------------------------------------------------+
                                        |
                                        +-> OTA