WordQ has made reading, writing, and communication easier and more accessible for millions of people around the world.
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Lean is a functional programming language and interactive theorem prover based on dependent type theory. Dependent type theory unites the worlds of programs and proofs; thus, Lean is also a programming language.
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- Open Source (Apache-2.0)
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F* is an ML-like functional programming language aimed at program verification. F* can express precise specifications for programs, including functional correctness properties. Programs written in F* can be translated to OCaml or F# for execution.

A trustworthy, industrial-strength interactive theorem prover and dependently-typed programming language for mechanised reasoning in mathematics, computer science and more.



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- Linux

Agda is a dependently typed functional programming language. It has inductive families, i.e., data types which depend on values, such as the type of vectors of a given length. It also has parametrised modules, mixfix operators, Unicode characters, and an interactive Emacs...
Penmob is a space for writers and bloggers to improve their craft through real, human feedback.
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