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Agda is a dependently typed functional programming language, and a proof assistant.
- MIT/X11 License
Idris is a general purpose pure functional programming language with dependent types and features inspired by Haskell and ML. Dependent types allow types to be predicated on values, meaning that some aspects of a program’s behaviour can be specified precisely in the type. It is compiled, with eager evaluation.
- Revised BSD License
Twelf is a language used to specify, implement, and prove properties of deductive systems such as programming languages and logics.
- Simplified BSD License