I like Forth, but let us be honest, building stuff that last, that is efficient, that will not bitrot, that is built like a tank — you can do it with most of langauges!

Some projects (most popular one is CollapseOS) had reasons to pick Forth, but there are people with similar ethos who picked up C (check this game).

Welcome!

@Cassette_Punk_2045 any language that can relate to the pmc design principles - https://permacomputing.net/principles - is relevant to pmc. There are no ideal languages though, no ideal solution, it’s all very situated and context dependent. With that said FORTH has historically demonstrated interesting features and approaches that have inspired a lot of people close to pmc, but other noteworthy languages that often come back in pmc related discussions are Lua and Zig.

Collapse OS – Why Forth? – but I think most of the concatenative languages would be just as flexible, like Factor or Uxn

I would think C would work as long as you restrict it to a minimal base set: c89 -Wall -Werror -Wpedantic – or be brave and use -nostdlib – but keep in mind, C was a mainframe language, it only later got adopted for microcomputers and then microcontrollers

but aside from those, you are looking for a language that:

• doesn’t require a lot of resources (power, memory, or storage)
• can be bootstrapped relatively easily: sectorForth, milliForth, sectorLisp, uLisp, Uxn
• has enough existing code (and community) to learn from (and isn’t some grad project that was abandoned after post-graduation)
• but also doesn’t have so much code that it’s now synonymous with lake-burning scrapers fouling the waters
• can run in constrained environments: commodity microcontrollers, 8-bit processors
• can be compiled in those same constrained environments (being able to bootstrap it rather than needing a server farm to cross compile it)

Forget forth. You need to learn iptscrae! Script the stack!