Section 3 of the manual describes all library functions excluding the library functions (system call wrappers) described in Section 2, which implement system calls.

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Coro::AIO
truly asynchronous file and directory I/O
Coro::AnyEvent
integrate threads into AnyEvent
Coro::BDB
truly asynchronous bdb access
Coro::Channel
message queues
Coro::Debug
various functions that help debugging Coro programs
Coro::EV
do events the coro-way, with EV
Coro::Event
do events the coro-way, with Event
Coro::Handle
non-blocking I/O with a blocking interface
Coro::Intro
An introduction to Coro
Coro::LWP
make LWP non-blocking - as much as possible
Coro::MakeMaker
MakeMaker glue for the XS-level Coro API
Coro::RWLock
reader/write locks
Coro::Select
a (slow but coro-aware) replacement for CORE::select
Coro::Semaphore
counting semaphores
Coro::SemaphoreSet
efficient set of counting semaphores
Coro::Signal
thread signals (binary semaphores)
Coro::Socket
non-blocking socket-I/O
Coro::Specific
manage coroutine-specific variables
Coro::State
first class continuations
Coro::Storable
offer a more fine-grained Storable interface
Coro::Timer
timers and timeouts, independent of any event loop
Coro::Twiggy
Coro interface for Twiggy
Coro::Util
various utility functions
Corona
Coro based PSGI web server
Courier::Config
Class providing configuration information for Perl modules related to the Courier MTA
Courier::Error
Exception class for Perl modules related to the Courier MTA
Courier::Filter
Purely Perl-based mail filter framework for the Courier MTA
Courier::Filter::Logger
Abstract base class for loggers used by the Courier::Filter framework
Courier::Filter::Logger::File
File logger for the Courier::Filter framework
Courier::Filter::Logger::IOHandle
I/O handle logger for the Courier::Filter framework
Courier::Filter::Logger::Syslog
Syslog logger for the Courier::Filter framework
Courier::Filter::Module
Abstract Perl base class for filter modules used by the Courier::Filter framework
Courier::Filter::Module::BlankBody
Blank-body message filter module for the Courier::Filter framework
Courier::Filter::Module::ClamAVd
ClamAV clamd filter module for the Courier::Filter framework
Courier::Filter::Module::DNSBL
DNS black-list filter module for the Courier::Filter framework
Courier::Filter::Module::Envelope
Message envelope filter module for the Courier::Filter framework
Courier::Filter::Module::FakeDate
Fake "Date:" message header filter module for the Courier::Filter framework
Courier::Filter::Module::Header
Message header filter module for the Courier::Filter framework
Courier::Filter::Module::MIMEParts
Message (MIME multipart and ZIP archive) parts filter module for the Courier::Filter framework
Courier::Filter::Module::Parts
Message (MIME multipart and ZIP archive) parts filter module for the Courier::Filter framework
Courier::Filter::Module::SPF
SPF filter module for the Courier::Filter framework
Courier::Filter::Module::SPFout
Outbound SPF filter module for the Courier::Filter framework
Courier::Filter::Module::SendCopy
Pseudo-filter for the Courier::Filter framework that sends a copy of certain messages to additional recipients
Courier::Filter::Module::SpamAssassin
SpamAssassin message filter module for the Courier::Filter framework
Courier::Filter::Overview
Architectural and administrative overview of Courier::Filter
Courier::Filter::Util
Utility class used by the Courier::Filter framework
Courier::Message
Class implementing an interface to a mail message in the Courier MTA's message queue
Courriel
High level email parsing and manipulation
Courriel::Builder
Build emails with sugar
Courriel::Header
A single header's name and value
Courriel::Header::ContentType
The content type for an email part
Courriel::Header::Disposition
The content disposition for an email part
Courriel::HeaderAttribute
A single attribute belonging to a header
Courriel::Headers
The headers for an email part
Courriel::Part::Multipart
A part which contains other parts
Courriel::Part::Single
A part which does not contain other parts, only content
Coy
like Carp only prettier
Cpanel::JSON::XS
cPanel fork of JSON::XS, fast and correct serializing
Cpanel::JSON::XS::Boolean
true and false values
Cpanel::JSON::XS::Type
Type support for JSON encode
Creator
recreates catalog-managed objects from disk and instantiates component views from their class identifiers
Crypt::Argon2
Perl interface to the Argon2 key derivation functions
Crypt::AuthEnc
[internal only]
Crypt::AuthEnc::CCM
Authenticated encryption in CCM mode
Crypt::AuthEnc::ChaCha20Poly1305
Authenticated encryption in ChaCha20-Poly1305 mode
Crypt::AuthEnc::EAX
Authenticated encryption in EAX mode
Crypt::AuthEnc::GCM
Authenticated encryption in GCM mode
Crypt::AuthEnc::OCB
Authenticated encryption in OCBv3 mode
Crypt::Bcrypt
A modern bcrypt implementation
Crypt::Blowfish
Perl Blowfish encryption module
Crypt::CAST5
CAST5 block cipher
Crypt::CBC
Encrypt Data with Cipher Block Chaining Mode
Crypt::Checksum
[internal only]
Crypt::Checksum::Adler32
Compute Adler32 checksum
Crypt::Checksum::CRC32
Compute CRC32 checksum
Crypt::Cipher
Generic interface to cipher functions
Crypt::Cipher::AES
Symmetric cipher AES (aka Rijndael), key size: 128/192/256 bits
Crypt::Cipher::Anubis
Symmetric cipher Anubis, key size: 128-320 bits
Crypt::Cipher::Blowfish
Symmetric cipher Blowfish, key size: 64-448 bits
Crypt::Cipher::CAST5
Symmetric cipher CAST5 (aka CAST-128), key size: 40-128 bits
Crypt::Cipher::Camellia
Symmetric cipher Camellia, key size: 128/192/256 bits
Crypt::Cipher::DES
Symmetric cipher DES, key size: 64[56] bits
Crypt::Cipher::DES_EDE
Symmetric cipher DES_EDE (aka Triple-DES, 3DES), key size: 192[168] bits
Crypt::Cipher::IDEA
Symmetric cipher IDEA, key size: 128 bits
Crypt::Cipher::KASUMI
Symmetric cipher KASUMI, key size: 128 bits
Crypt::Cipher::Khazad
Symmetric cipher Khazad, key size: 128 bits
Crypt::Cipher::MULTI2
Symmetric cipher MULTI2, key size: 320 bits
Crypt::Cipher::Noekeon
Symmetric cipher Noekeon, key size: 128 bits
Crypt::Cipher::RC2
Symmetric cipher RC2, key size: 40-1024 bits
Crypt::Cipher::RC5
Symmetric cipher RC5, key size: 64-1024 bits
Crypt::Cipher::RC6
Symmetric cipher RC6, key size: 64-1024 bits
Crypt::Cipher::SAFERP
Symmetric cipher SAFER+, key size: 128/192/256 bits
Crypt::Cipher::SAFER_K128
Symmetric cipher SAFER_K128, key size: 128 bits
Crypt::Cipher::SAFER_K64
Symmetric cipher SAFER_K64, key size: 64 bits
Crypt::Cipher::SAFER_SK128
Symmetric cipher SAFER_SK128, key size: 128 bits
Crypt::Cipher::SAFER_SK64
Symmetric cipher SAFER_SK64, key size: 64 bits
Crypt::Cipher::SEED
Symmetric cipher SEED, key size: 128 bits
Crypt::Cipher::Serpent
Symmetric cipher Serpent, key size: 128/192/256 bits
Crypt::Cipher::Skipjack
Symmetric cipher Skipjack, key size: 80 bits
Crypt::Cipher::Twofish
Symmetric cipher Twofish, key size: 128/192/256 bits