to alternatives and similar packages

Based on the "Control" category.
Alternatively, view to alternatives based on common mentions on social networks and blogs.

rio-orphans

9.9 0.0 to VS rio-orphans

A standard library for Haskell
funflow

9.8 3.5 to VS funflow

Functional workflows

WorkOS - The modern identity platform for B2B SaaS

The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

Promo workos.com

fused-effects

9.8 4.5 to VS fused-effects

A fast, flexible, fused effect system for Haskell
machines

9.8 3.6 to VS machines

Networks of composable stream transducers
pipes

9.8 0.0 to VS pipes

Compositional pipelines
transient

9.8 0.0 to VS transient

A full stack, reactive architecture for general purpose programming. Algebraic and monadically composable primitives for concurrency, parallelism, event handling, transactions, multithreading, Web, and distributed computing with complete de-inversion of control (No callbacks, no blocking, pure state)
mtl

9.8 0.0 to VS mtl

The Monad Transformer Library
apecs

9.7 7.3 to VS apecs

a fast, extensible, type driven Haskell ECS framework for games
recursion-schemes

9.7 4.9 to VS recursion-schemes

Generalized bananas, lenses and barbed wire
foldl

9.6 4.3 to VS foldl

Composable, streaming, and efficient left folds
classy-prelude

9.6 5.9 to VS classy-prelude

Type classes for mapping, folding, and traversing monomorphic containers
free

9.6 4.1 to VS free

free monads
capability

9.6 2.7 to VS capability

Extensional capabilities and deriving combinators
record

9.6 0.0 to VS record

Anonymous records
classy-prelude-yesod

9.6 5.9 to VS classy-prelude-yesod

Type classes for mapping, folding, and traversing monomorphic containers
freer-simple

9.6 0.0 to VS freer-simple

A friendly effect system for Haskell
distributed-closure

9.5 3.9 to VS distributed-closure

Serializable closures for distributed programming.
selective

9.5 4.4 to VS selective

Selective Applicative Functors: Declare Your Effects Statically, Select Which to Execute Dynamically
safe-exceptions

9.5 3.4 to VS safe-exceptions

Safe, consistent, and easy exception handling
extensible-effects

9.5 0.0 to VS extensible-effects

Extensible Effects: An Alternative to Monad Transformers
auto

9.5 0.0 to VS auto

Haskell DSL and platform providing denotational, compositional api for discrete-step, locally stateful, interactive programs, games & automations. http://hackage.haskell.org/package/auto
these

9.5 4.3 to VS these

An either-or-both data type, with corresponding hybrid error/writer monad transformer.
unliftio

9.5 3.9 to VS unliftio

The MonadUnliftIO typeclass for unlifting monads to IO
ComonadSheet

9.4 0.0 to VS ComonadSheet

A library for expressing "spreadsheet-like" computations with absolute and relative references, using fixed-points of n-dimensional comonads.
retry

9.4 1.6 to VS retry

Retry combinators for monadic actions that may fail
abstract-par

9.4 5.6 to VS abstract-par

Type classes generalizing the functionality of the 'monad-par' library.
hask

9.4 0.0 to VS hask

Category theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)
transient-universe

9.3 0.0 to VS transient-universe

A Cloud monad based on transient for the creation of Web and reactive distributed applications that are fully composable, where Web browsers are first class nodes in the cloud
parallel

9.3 4.4 to VS parallel

a library for parallel programming
cloud-haskell

9.2 0.0 to VS cloud-haskell

DISCONTINUED. This is an umbrella development repository for Cloud Haskell
frpnow

9.2 0.0 to VS frpnow

Principled practical FRP
distributed-fork

9.2 0.0 to VS distributed-fork

A distributed data processing framework in Haskell.
either

9.2 0.6 to VS either

the EitherT monad transformer
deepseq

9.1 3.3 to VS deepseq

Deep evaluation of data structures
ifcxt

9.1 0.0 to VS ifcxt

constraint level if statements
monad-validate

9.1 0.0 to VS monad-validate

DISCONTINUED. (NOTE: REPOSITORY MOVED TO NEW OWNER: https://github.com/lexi-lambda/monad-validate) A Haskell monad transformer library for data validation
contravariant

9.1 0.0 to VS contravariant

Haskell 98 contravariant functors
distributed-process-platform

9.1 0.0 to VS distributed-process-platform

DEPRECATED (Cloud Haskell Platform) in favor of distributed-process-extras, distributed-process-async, distributed-process-client-server, distributed-process-registry, distributed-process-supervisor, distributed-process-task and distributed-process-execution
tardis

9.1 5.5 to VS tardis

Bidirectional state monad transformer
errors

9.0 3.1 to VS errors

Type-safe error handling
freer-effects

9.0 0.0 to VS freer-effects

DISCONTINUED. An implementation of "Freer Monads, More Extensible Effects".
effect-monad

9.0 0.0 to VS effect-monad

Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.
monad-control

9.0 0.0 to VS monad-control

Lift control operations, like exception catching, through monad transformers
ixmonad

9.0 0.0 to VS ixmonad

Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.
operational

9.0 4.3 to VS operational

Implement monads by specifying instructions and their desired operational semantics.
motor

8.9 0.0 to VS motor

Type-safe effectful state machines in Haskell
lens-tutorial

8.9 0.0 to VS lens-tutorial

The missing tutorial module for the lens library
monad-time

8.9 4.6 to VS monad-time

Type class for monads which carry the notion of the current time.
exceptions

8.9 5.4 to VS exceptions

mtl friendly exceptions
mmorph

8.9 0.0 to VS mmorph

Monad morphisms