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Lean

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Lean is a functional programming language that makes it easy to write correct

and maintainable code. You can also use Lean as an interactive theorem prover.

Lean programming primarily involves defining types and functions. This allows

your focus to remain on the problem domain and manipulating its data, rather

than the details of programming.

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Open-source manufacturing ERP, MES and QMS. Quoting, MRP, inventory, shop floor, quality and lot/serial traceability on one Postgres schema, with a REST API and MCP server. Self-host or use Carbon Cloud.

  • Updated Sep 30, 2026
  • TypeScript

Created by Leonardo de Moura

Released 2013

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Repository
leanprover/lean
Website
github.com/topics/lean
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