| Name | Version | Description |
|---|---|---|
| haskell-recaptcha | Functions for using the reCAPTCHA service in web applications. | |
| haskell-recursion-schemes | Representing common recursion patterns as higher-order functions | |
| haskell-recv | Efficient network recv | |
| haskell-reducers | Semigroups, specialized containers and a general map/reduce framework | |
| haskell-refact | Specify refactorings to perform with apply-refact | |
| haskell-refinery | Toolkit for building proof automation systems | |
| haskell-reflection | Reifies arbitrary terms into types that can be reflected back into terms | |
| haskell-regex | Toolkit for regex-base | |
| haskell-regex-applicative | Regex-based parsing with applicative interface | |
| haskell-regex-applicative-text | Wrapped regex-applicative primitives to work with Text | |
| haskell-regex-base | Common "Text.Regex.*" API for Regex matching | |
| haskell-regex-compat | Replaces and enhances Text.Regex | |
| haskell-regex-compat-tdfa | One module layer over regex-tdfa to replace Text.Regex. | |
| haskell-regex-pcre | PCRE Backend for Text.Regex (regex-base) | |
| haskell-regex-posix | POSIX Backend for Text.Regex (regex-base) | |
| haskell-regex-tdfa | Pure Haskell Tagged DFA Backend for Text.Regex (regex-base) | |
| haskell-reinterpret-cast | Memory reinterpretation casts for Float/Double and Word32/Word64 | |
| haskell-relude | Safe, performant, user-friendly and lightweight Haskell Standard Library. | |
| haskell-repline | Haskeline wrapper for GHCi-like REPL interfaces | |
| haskell-req | HTTP client library | |
| haskell-rere | Regular-expressions extended with fixpoints for context-free powers | |
| haskell-rerebase | Reexports from "base" with a bunch of other standard libraries | |
| haskell-resolv | Domain Name Service (DNS) lookup via the libresolv standard library routines | |
| haskell-resource-pool | A high-performance striped resource pooling implementation | |
| haskell-resourcet | Deterministic allocation and freeing of scarce resources. | |
| haskell-retrie | A powerful, easy-to-use codemodding tool for Haskell. | |
| haskell-retry | Retry combinators for monadic actions that may fail | |
| haskell-rfc5051 | Simple unicode collation as per RFC5051. | |
| haskell-rio | A standard library for Haskell | |
| haskell-rio-orphans | Orphan instances for the RIO type in the rio package | |
| haskell-rio-prettyprint | Pretty-printing for RIO | |
| haskell-roman-numerals | Parsing and pretty printing of Roman numerals | |
| haskell-rope-utf16-splay | Ropes optimised for updating using UTF-16 code units and row/column pairs | |
| haskell-row-types | Open Records and Variants | |
| haskell-rsa | Implementation of RSA, using the padding schemes of PKCS#1 v2.1. | |
| haskell-rvar | Random Variables | |
| haskell-s-cargot | A flexible, extensible s-expression library. | |
| haskell-safe | Library of safe (exception free) functions | |
| haskell-safe-exceptions | Safe, consistent, and easy exception handling | |
| haskell-safecopy | Binary serialization with version control. | |
| haskell-safesemaphore | Much safer replacement for QSemN, QSem, and SampleVar | |
| haskell-sandi | Data encoding library | |
| haskell-sandwich | Yet another test framework for Haskell | |
| haskell-say | Send textual messages to a Handle in a thread-friendly way | |
| haskell-sayable | Construction of context-adjusted pretty output | |
| haskell-sbv | SMT Based Verification: Symbolic Haskell theorem prover using SMT solving | |
| haskell-scientific | Numbers represented using scientific notation | |
| haskell-scotty | Haskell web framework inspired by Ruby's Sinatra, using WAI and Warp | |
| haskell-sdl2 | Both high- and low-level bindings to the SDL library | |
| haskell-sdl2-ttf | Bindings to SDL2_ttf |
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