PostgreSQL database performance insights

A Pretty Extraordinary Zipper library

Proof Editor for Sequent Calculus

Persona (BrowserID) library

A persistent sequence based on array mapped tries

Generate classy lens field accessors for persistent models

STM transactions involving persistent storage

relational-record on persisten backends

Haskell references backed by an IntMap for persistence and reversibility

A library for rate limiting activities with a persistent backend

Memory-constant streaming of Persistent entities from PostgreSQL

Backend for the persistent library using ODBC

A pure haskell backend for the persistent library using MySQL database server

A pure haskell backend for the persistent library using MySQL database server

Monad transformer for the persistent API

Backend for the persistent library using mongoDB

Code for using the ip package with yesod

Derive Persistent classes generically

Persistent equivalence relations (aka union-find)

Parse DATABASE_URL into configuration types for Persistent

Helper functions for writing Persistent instances

Transforms persist's quasi-quoted syntax into ER format

Serialization library with state and leb128 encoding

Minimal serialization library with focus on performance

Generalised permutation parser combinator

A library for permutations and combinations

A library for working with periodic polynomials (very basic functionality)

Periodic task system common

A reliable at-least-once periodic job scheduler backed by redis

Perhaps, a monad

Library for performing vector shuffles

Database migration support for use in other libraries

The perceptron learning algorithm

Percent encode/decode ByteStrings

Create beautiful diagrams just by typing mathematical notation in plain text

Parser combinators for trees in the Penn Treebank format

Static site generator

The Parser Generator for Haskell

a lazy non-deterministic concatenative programming language

A pedestrian implementation of directed acyclic graphs

Parser for PE/COFF format

pdynload is polymorphic dynamic linking library

Wrapper around the pdfinfo command

Simple pdf viewer

Template format definition for pdf-slave tool

Web service for pdf-slave tool

Integration over convex polytopes

pcre-light extra functionality

A fast, pseudorandom number generator

Template Haskell for embedding text rendered using PCF fonts

PCF font parsing and rendering library

PCD file loader

pbc for HsLua

Utility CLI for working with protobuf files

pastebin command line application

PayPal API, currently supporting "ButtonManager"

Client for a limited part of PayPal's Adaptive Payments API

A Haskell wrapper for the Paynow payment gateway

Pattern tries

A library for compiling pattern-matching to decision trees

A webpage scraper for Patreon which dumps a list of patrons to a text file

Library for representing and manipulating type-safe file paths

A toy pathfinding library

Read and write UTF-8 text files

A singleton wrapper for the `path` library

Formatting for path

Patches (diffs) on vectors: composable, mergeable, and invertible

A simple command line pasting utility

Interface to the past.is URL shortening service

Provides the Pasta curves: Pallas, Vesta and their field elements Fp and Fq

PostgreSQL Abstract Syntax Tree Assember

Password generation/validation library

Deterministic password generator core

a simple password manager

Parallel code generation for hierarchical Bayesian modeling

Platform-Agnostic Security Tokens

Inspect, create, and alter MBRs

Property testing for partial semigroups using Hedgehog

A partial binary associative operator

Template haskell utilities for constructing records with default values

Provides typeclass suitable for types admitting a partial order

Haskell 98 Partial Lenses

A fast, minimal parser

A fast parser combinator library backed by Typed Template Haskell

Parser combinators with slicing, error recovery, and syntax highlighting

Monadic parser combinators derived from Parsec

`parsers` instances for Megaparsec

TH parser generator for splitting bytestring into fixed-width fields

An interface to create production rules using augmented grammars

Parsing library with unbiased choice and support for embedding arbitrary monad

Prints Haskell parse trees in JSON

Test suite of parser-combinators

Adds and Eq instance for Parsec's ParseError if needed

Monadic parser combinators

Monadic parser combinators

Pratt Parser combinator for Parsec

Parsing instances for Parsec

Parsec API encoded as a deeply-embedded DSL, for debugging and analysis

Some miscellaneous basic string parsers