uiua

Uiua is a tacit array programming language where primitives are single glyphs and data flows through a stack instead of named variables. You type ASCII, the built-in formatter rewrites it into symbols. It's in the APL and BQN lineage, MIT licensed, community-funded, and you can try it in the browser at uiua.org without installing anything.

Local install is a release binary or cargo install. The real cost is conceptual: array thinking plus point-free style is a steep climb even for people arriving from other array languages.

This is for programmers who find array languages beautiful, code golfers, and anyone who wants their brain bent in a productive direction. Nobody should ship production systems in it, and the project would tell you the same. BQN and J are the OSS peers; Dyalog APL is the commercial ancestor.

The catch: the language is explicitly unstable, with a long history of breaking changes, and current releases are still renaming fundamental primitives. Code you write today will need rewriting. That's the price of watching a language get designed in the open.