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cpp
https://leanpub.com/b/modernccollection
    https://leanpub.com/c20
        63E680FE1664871F27B522FC0A95A157
        F865868C626C7386C2B61E45536E24DD
        1FB25AD61299B1DA8DD7EF5D37D7CA06
    https://leanpub.com/concurrencywithmodernc

fp
https://leanpub.com/fp-made-easier
https://leanpub.com/outsidefp
hs
https://leanpub.com/simple-haskell-book
kt
https://leanpub.com/coroutines