Haskell

A History of Haskell: Being Lazy With Class by Paul Hudak, John Hughes, Simon Peyton Jones
📜 Tackling the Awkward Squad: monadic input/output, concurrency, exceptions, and foreign-language calls in Haskell by Simon Peyton Jones
📜 Making a Fast Curry: Push/Enter vs. Eval/Apply for Higher-order Languages by Simon Marlow and Simon Peyton Jones. A classic... describes well the execution model GHC uses for Haskell, and catches the brilliant authors in a design pivot from original intuition to new conclusions based on empirical data.
📜 A Poor Man's Concurrency Monad by Koen Claessen. Paper describes how without adding any primitives to the language, you could define a concurrency monad transformer in Haskell.
📜 Parallel Generational-Copying Garbage Collection with a Block-Structured Heap. In Haskell, data immutability forces us to produce a lot of temporary data but also helps to collect this garbage rapidly. This paper explains how the Glasgow Haskell Compiler accomplishes this task in a simple, yet effective, manner with no programmer intervention.