Retro is a modern, pragmatic set of Forths drawing influence from many sources. It clean, elegant, tiny, easy to grasp, and adaptable to many tasks.
It's not a traditional Forth. Drawing influence from colorForth, it uses prefixes to guide the compiler. From Joy and Factor, it uses quotations (anonymous, nestable functions) and combinators (functions that operate on functions) for much of the stack and flow control. It also adds vocabularies for working with strings, arrays, and other data types. Source files are written in Unu, allowing for simple, literate sources.
The source and documentation are distributed under the ISC license.
Web Chat on IRC
#retro on irc.libera.chat
New releases are normally made in January, July.
The current release is 2022.1
These are updated hourly.
Latest Documentation (epub)
Latest Documentation (text)
retro.c (Amalgamation for BSD, Linux, Haiku, Windows)
Running on Napia, a new virtual machine for resource constrained targets, this is a new implementation of RetroForth.
It's not complete yet, and (due to differences needed because of resource constraints and the new underlying architecture) is not fully compatible with RetroForth/Nga, though it should be quite familiar for those using RetroForth/Nga.