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Top 23 Forth Forth Projects
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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lbForth
Self-hosting metacompiled Forth, bootstrapping from a few lines of C; targets Linux, Windows, ARM, RISC-V, 68000, PDP-11, asm.js.
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Project mention: Sectorforth is a 16-bit x86 Forth that fits in a 512-byte boot sector | news.ycombinator.com | 2026-08-16
C64: https://github.com/jkotlinski/durexforth
It's impressive what you can do in the C64 with just Forth instead of C64 Basic.
For Speccy/ZX80/ZX81, I'm pretty sure they ported the Jupyter ACE one, boosting up
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Project mention: R3forth: A Concatenative Language Derived from ColorForth | news.ycombinator.com | 2026-02-18
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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cc64
cc64 is a small-C compiler written in Forth, hosted on the Commodore C64, Plus4 and C16 with 64k, and on the Commander X16. It is targeting the 6502 CPU.
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Project mention: Sectorforth is a 16-bit x86 Forth that fits in a 512-byte boot sector | news.ycombinator.com | 2026-08-16
I love both Forth and Lisp but SectorLisp it's far better.
Also, for a small demo, check Eforth under Subleq/Muxleq:
https://github.com/howerj/subleq
edit subleq.fth/muxleq.fth and set these options to 1:
defined eforth [if] ' ) ! [then] ( Turn off ok prompt )
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Forth Forth discussion
Forth Forth related posts
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Sectorforth is a 16-bit x86 Forth that fits in a 512-byte boot sector
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Show HN: Code garden deep-dive: my Forth C64 tetromino game
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CSS Is DOOMed
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Forth??
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Show HN: R3forth, a ColorForth-inspired language with a tiny VM
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Forth – is it still relevant?
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Implementing DOES> in Forth, the entire reason I started this mess
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A note from our sponsor - AppSignal
www.appsignal.com | 9 Oct 2026
Index
What are some of the best open-source Forth projects in Forth? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Mako | 599 |
| 2 | lbForth | 482 |
| 3 | zeptoforth | 355 |
| 4 | swapforth | 305 |
| 5 | durexforth | 274 |
| 6 | r3 | 227 |
| 7 | gforth | 191 |
| 8 | miniforth | 162 |
| 9 | r4 | 141 |
| 10 | eulex | 134 |
| 11 | cc64 | 121 |
| 12 | worms | 98 |
| 13 | TclForth | 96 |
| 14 | subleq | 83 |
| 15 | openfirmware | 82 |
| 16 | VolksForth | 82 |
| 17 | spf | 69 |
| 18 | r3d4 | 64 |
| 19 | may4 | 41 |
| 20 | CAMEL99-ITC | 31 |
| 21 | gforth-raylib | 29 |
| 22 | solo-forth | 28 |
| 23 | lfsr | 17 |
Sponsored
AppSignal knows why the f*#k it crashed.
Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
www.appsignal.com