O'Haskell is Haskell conservatively extended with static subtyping and monadic objects. O'Haskell last saw a release in 2001, and has reportedly been superseded by Timber.
- O'Haskell, as archived by the Wayback Machine
- A survey of O'Haskell
- Source code for O'Haskell
- Haskell's overlooked object system (PDF) -- Object oriented concepts in pure Haskell.
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