Here are all the CPAN distributions that start with the letter E:

E-Mail-Acme
E2-Interface
E_Editor
EAFDSS
EAI-Wrap
Earlybird
Earth
Earth-USA-Washington-Cascadia
Earthquake-EEW-Decoder
Earthquake_EEW_Decoder
Easy-Log
Easy-Options
Easy-WML
EasyArgs
EasyCGI
EasyDate
EasyDateTime
EasyDB
EasyDBAccess
EasyMail
EasyPDF
EasySession
EasySpiderTCP
EasyTCP
EasyTool
EasyTool-TimeFunc
EasyWML
EAV-XS
eBay
eBay-API
eBay-API-Docs
eBay-API-Simple
EBI-FGPT-FuzzyRecogniser
EBook-EPUB
EBook-EPUB-Check
EBook-EPUB-Lite
EBook-FB2
EBook-Generator
EBook-MOBI
EBook-MOBI-Image
EBook-Tools
ebx
ebXML
ebXML-Message
ec
echo
Echo-StreamServer
Echo360
ecl
Ecma48-Util
Ed2k_link
EdgeExpressDB
edgegrid-perl
Edi2SGML
Editsrc-Uggedit
EekBoek
EERPG
Eesh
EFL
Egg-Model-Cache
Egg-Model-DBIC
Egg-Model-FsaveDate
Egg-Plugin-Authen-Captcha
Egg-Plugin-BackUP-Easy
Egg-Plugin-Blosxom
Egg-Plugin-Cache
Egg-Plugin-Cache-UA
Egg-Plugin-Crypt-CBC
Egg-Plugin-IxHash
Egg-Plugin-Log-Syslog
Egg-Plugin-LWP
Egg-Plugin-MailSend
Egg-Plugin-Net-Ping
Egg-Plugin-Net-Scan
Egg-Plugin-SessionKit
Egg-Plugin-SessionKit-Auth
Egg-Plugin-SessionKit-Bind-URI
Egg-Release
Egg-Release-Authorize
Egg-Release-DBI
Egg-Release-DBIC
Egg-Release-JSON
Egg-Release-Mail
Egg-Release-XML-FeedPP
Egg-View-TT
eGuideDog-Dict-Cantonese
eGuideDog-Dict-Mandarin
eGuideDog-Festival
Ei
eicndhcpd
eicndhcpd_10_src
eicndhcpd_v111_src
Eidolon
Eidolon-Driver-DB-MySQL
Eidolon-Driver-DB-PostgreSQL
Eidolon-Driver-Log-Basic
Eidolon-Driver-Router-Basic
Eidolon-Driver-Router-Consequent
Eidolon-Driver-Template-HTML
Eidolon-Driver-Template-Toolkit
Eidolon-Driver-User-Basic
eigenstates
Eircode
eirotic
Eixo-Base
Eixo-Docker
Eixo-Queue
Eixo-Rest
Eixo-Zone
Eixo-Zone-Driver
EixoUtils
EJBCA-CrlPublish
EJS-Template
Ekahau
ekgping
ELab-Client
Elastic-Model
ElasticEmail
ElasticSearch
Elasticsearch-Compat
Elasticsearch-Cxn-NetCurl
Elasticsearch-Model
ElasticSearch-SearchBuilder
ElasticSearch-Transport-AECurl
ElasticSearch-Transport-AEHTTP
ElasticSearch-Transport-Curl
ElasticSearch-Transport-Thrift
ElasticSearchX-Autocomplete
ElasticSearchX-Autocomplete-GeoNames
ElasticSearchX-Model
ElasticSearchX-Model-Generator
ElasticSearchX-Sequence
ElasticSearchX-UniqueKey
Elastijk
Electron
Electronics-PSU-DPSxxxx
Electronics-SigGen-FY3200
ELF-Extract-Sections
elf-sign
ELF-Writer
ELFF-Parser
Elive
Elive-StandardV2
Elive-StandardV3
Eliza-Chatbot
elmtag
Eludia
Eludia-Install
Emacs-EPL
Emacs-Lisp
Emacs-PDE
Emacs-PerlmacsPatch
emacs-pod-cperl-mode
Emacs-Rep
Emacs-Run
Emacs-Run-ExtractDocs
emacs-tap-mode
Email-Abstract
Email-Abstract-QpsmtpdTransaction
Email-Address
Email-Address-Classify
Email-Address-JP-Mobile
Email-Address-List
Email-Address-Loose
Email-Address-UseXS
Email-Address-XS
Email-AddressParser
Email-Archive
Email-ARF
Email-ARF-Hotmail
Email-Assets
Email-Auth-AddressHash
Email-AutoReply
Email-Barcode-Decode
Email-Blaster
Email-ConstantContact
Email-Date
Email-Date-Format
Email-Delete
Email-ECGListe
Email-Enkoder
Email-Envelope
Email-ExactTarget
Email-Extractor
Email-Filter
Email-Filter-Rules
Email-Filter-SpamAssassin
Email-Find
Email-Fingerprint
Email-Folder
Email-Folder-Exchange
Email-Folder-IMAP
Email-Folder-IMAPS
Email-Folder-POP3
Email-Folder-Search
Email-FolderType
Email-FolderType-Net
Email-Forward-Dispatch
Email-Handle
Email-IsEmail
Email-IsFree
Email-IsFree-CN
Email-LocalDelivery
Email-LocalDelivery-Ezmlm
Email-LocalDelivery-Store
Email-Mailer
Email-MessageID
Email-MIME
Email-MIME-Attachment-Stripper
Email-MIME-ContentType
Email-MIME-CreateHTML
Email-MIME-Creator
Email-MIME-Creator-ISO_2022_JP
Email-MIME-Encodings
Email-MIME-Kit
Email-MIME-Kit-Assembler-Markdown
Email-MIME-Kit-Assembler-TextifyHTML
Email-MIME-Kit-Bulk
Email-MIME-Kit-KitReader-SWAK
Email-MIME-Kit-Renderer-MicroMason
Email-MIME-Kit-Renderer-Text-Template
Email-MIME-Kit-Renderer-TT
Email-MIME-Kit-Renderer-Xslate
Email-MIME-Kit-Validator-Rx
Email-MIME-MobileJP
Email-MIME-Modifier
Email-MIME-RFC2047
Email-MIME-XMTP
Email-MIME-XPath
Email-Notmuch
Email-Obfuscate
Email-Outlook-Message
Email-Pipemailer
Email-POP3-Markdown
Email-Postman
Email-PST-Win32
Email-Public
Email-Queue
Email-Received
Email-Reply
Email-Sample
Email-Send
Email-Send-126
Email-Send-Gandi
Email-Send-Gmail
Email-Send-IO
Email-Send-Netease
Email-Send-SMTP-Auth
Email-Send-SMTP-Gmail
Email-Send-SMTP-TLS
Email-Send-Test
Email-Send-Test-DataDumper
Email-Send-TheSchwartz
Email-Send-YYClouds
Email-Send-Zoho
Email-Sender
Email-Sender-Server
Email-Sender-Transport-Mailgun
Email-Sender-Transport-QMQP
Email-Sender-Transport-Redirect
Email-Sender-Transport-SMTP-TLS
Email-Sender-Transport-SMTPS
Email-Sender-Transport-SQLite
Email-SendGrid
Email-SendGrid-V3
Email-Simple
Email-Simple-Creator
Email-Simple-FromHandle
Email-Simple-Headers
Email-Simple-Markdown
Email-Simple-OneLineHeaders
Email-Simple-Test-TraceHeaders
Email-Store
Email-Store-Header
Email-Store-HTML
Email-Store-Language
Email-Store-NamedEntity
Email-Store-Plucene
Email-Store-Pristine
Email-Store-Summary
Email-Store-Thread
Email-StripMIME
Email-Stuff
Email-Stuffer
Email-Stuffer-TestLinks
Email-Template
Email-Thread
Email-Valid
Email-Valid-Loose
Email-Verify-SMTP
Email-VirusScan
Emailesque
emailvalidation
EmbedIT-WebIT
Embedix-DB
Embedix-ECD
Embperl
EMC-WideSky-symmaskdb
EMDIS-ECS
Emoji-NationalFlag
Emotion
Empire
Emplacken
Empyrion
Enbld
Enbugger
Enbugger-Restarts
Encode
Encode-Arabic
Encode-Arabic-Franco
Encode-Argv
Encode-Base2N
Encode-Base32-Crockford
Encode-Base32-GMP
Encode-Base58
Encode-Base58-BigInt
Encode-Base58-GMP
Encode-BetaCode
Encode-BOCU1
Encode-BOCU1-XS
Encode-Bootstring
Encode-Buckwalter
Encode-CN-Utility
Encode-CNMap
Encode-compat
Encode-compat-MIME-Header-ISO_2022_JP
Encode-Deep
Encode-Detect
Encode-Detect-CJK
Encode-Detect-Upload
Encode-Detective
Encode-DIN66003
Encode-DosHebrew
Encode-DoubleEncodedUTF8
Encode-Escape
Encode-EUCJPASCII
Encode-EUCJPMS
Encode-First
Encode-Float
Encode-Guess-Educated
Encode-HanConvert
Encode-HanDetect
Encode-HanExtra
Encode-HEBCI
Encode-HP
Encode-IBM
Encode-IMAPUTF7
Encode-InCharset
Encode-ISO2022
Encode-JavaScript-Cyrillic
Encode-JavaScript-UCS
Encode-JIS2K
Encode-JISX0213
Encode-JP-Emoji
Encode-JP-Emoji-FB_EMOJI_GMAIL
Encode-JP-Emoji-FB_EMOJI_TYPECAST
Encode-JP-Mobile
Encode-JP-Mobile-UnicodeEmoji
Encode-Korean
Encode-LaTeX
Encode-Locale
Encode-MAB2
Encode-Mapper
Encode-Multibyte-Detect
Encode-Newlines
Encode-PDFDoc
Encode-Positive-Digits
Encode-Positive-Pairs
Encode-Punycode
Encode-RAD50
Encode-Registry
Encode-Repair
Encode-Safename
Encode-Simple
Encode-StdIO
Encode-TECkit
Encode-Unicode-IMAPUTF7
Encode-Unicode-Japanese
Encode-Unicode-PerlDecodeJava
Encode-UTF8-Slow
Encode-UTF8Mac
Encode-UTR22
Encode-VN
Encode-Wechsler
Encode-Wordlist-PGP
Encode-ZapCP1252
Encoding-BER
Encoding-FixLatin
Encoding-FixLatin-XS
Encoding-HandleUtf8
Encoding-Huffman-PP6
encoding-source
encoding-split
encoding-stdio
encoding-warnings
End
End-Eval
End-Eval-Env
End-Eval-FirstArg
Endoscope
English-Control
English-Name
English-Reference
English-Script
EnsEMBL-Web-Record
ensure
Enterasys-NetSight
Enterprise-Licence
Entities
EntityModel
EntityModel-Cache-Memcached-Async
EntityModel-Class
EntityModel-EventLoop
EntityModel-EventLoop-IO-Async
EntityModel-Log
EntityModel-Storage-PostgreSQL
EntityModel-Web
EntityModel-Web-Apache2
EntityModel-Web-NaFastCGI
EntityModel-Web-PSGI
enum
enum-fields
enum-hash
enum-prefix
enumdnsserver
Enumerate-PerlList
Enumeration
Env
Env-Array
Env-Assert
Env-Bash
Env-Browser
Env-C
Env-Dot
Env-Export
Env-Heroku
Env-Modify
Env-Modulecmd
Env-Path
Env-PS1
Env-Sanctify
Env-Sanctify-Auto
Env-Sanctify-Moosified
Env-ShellWords
Env-Sourced
Env-Transaction
ENV-Util
EnvDir
Envy
EO
Eobj
EOL
epd2svg
EPEG
eperl
EPFL-Net-ipv6Test
EPFL-Net-SSLTest
EPFL-Sciper-List
EPFL-Service-Open
EPL2
ePod
Eponymous-Hash
ePortal
ePortal-Diskoteka
ePortal-MsgForum
ePortal-OffPhones
ePortal-Organizer
ePortal-SquidAcnt
EPrints-QueryBuilder
EPS
eps2png
EPUB-Parser
EPublisher
EPublisher-Source-Plugin-MetaCPAN
EPublisher-Source-Plugin-PerltutsCom
EPublisher-Target-Plugin-EPub
EPublisher-Target-Plugin-Mobi
EPublisher-Target-Plugin-OTRSDoc
eris
Erlang-Interface
Erlang-Parser
Erlang-Port
Erlang-Port4
Erob-L4Env
Err
Errno
Errno-AnyString
Error
Error-Base
Error-Dumb
Error-errors
Error-Exception
Error-Helper
Error-Hierarchy
Error-Pure
Error-Pure-Always
Error-Pure-ANSIColor
Error-Pure-HTTP
Error-Pure-HTTP-JSON
Error-Pure-JSON
Error-Pure-NoDie
Error-Pure-Output-ANSIColor
Error-Pure-Output-JSON
Error-Pure-Output-Tags-HTMLCustomPage
Error-Pure-Output-Text
Error-Return
Error-ROP
Error-Show
Error-Subclasses
Error-Tiny
Error-TryCatch
Error-Unhandled
Error-Wait
Errors
errors-pragma
Errors-Simple
ES-Senado
Escape-Houdini
Escort
esjis
esmith
ESplit
ESPPlus-Storage
Estante-PayPal
eSTAR-RTML
Etcd
Etcd-Lock
Etcd3
etext
Ethereum-RPC-Client
Etherpad
Etherpad-API
EthiopicDemo
EthiopicUnicode
Etk-Perl
ETL-Pequel
ETL-Pequel3-PlaceHolder
ETL-Pipeline
ETL-Yertl
ETLp
ETR-XML-SAX-FilterHandler
Etsy-StatsD
EUCJP
EV
EV-ADNS
EV-Cron
EV-Glib
EV-Hiredis
EV-Loop-Async
EV-Stream
EV-Stream-Crypt-RC4
EV-Stream-MatrixSSL
EV-Stream-Proxy-HTTPS
EV-Watcher-Bind
eval
Eval-Closure
Eval-Compile
Eval-Context
Eval-LineNumbers
Eval-Logic
Eval-Quosure
Eval-Reversible
Eval-Safe
Eval-Util
Eval-WithLexicals
evalign
EvaP
EVDB-API
Eve
Event
Event-Distributor
Event-ExecFlow
Event-File
Event-IO
Event-Join
Event-Lib
Event-Lib-UDPPump
Event-Lite
Event-Notify
Event-RPC
Event-Schedule
Event-ScreenSaver
Event-SlidingWindow
Event-Stats
Event-tcp
Event-tcpserv
Event-Wrappable
event_mail
event_read
EventCountFile
EventDrivenServer
Evented-API-Engine
Evented-Configuration
Evented-Object
EventServer
EventSource-Client
EventSource-Server
EventStore-Tiny
EveOnline-Api
EveOnline-SSO
Every
everywhere
Evid
EvilBoss
Evo
Evo-EA
Evo-GA
Evo-Immune
Evo-Inference
Evo-Maple
Evo-Parser
Evo-QUIP
Evo-XS
EvoScript
EWS-Calendar-Viewer
EWS-Client
ex-caution
ex-constant-vars
ex-ExtUtils-Install
ex-lib
ex-lib-zip
ex-monkeypatched
ex-newest
ex-override
exact
exact-class
exact-cli
exact-conf
exact-fun
exact-lib
exact-me
Example-MBtiny
Example-XS-FasterHashes
examples
Examples-Generator
Excel
Excel-CloneXLSX-Format
Excel-Grinder
Excel-PowerPivot-Utils
Excel-Table
Excel-Template
Excel-Template-Element-Cell-AutoSize
Excel-Template-Plus
Excel-Template-TT
Excel-Template-XLSX
Excel-Text-Template
Excel-ValueReader-XLSX
Excel-ValueWriter-XLSX
Excel-Writer-XLSX
Excel-Writer-XLSX-CDF
Excel-Writer-XLSX-Simple-Tabs
excel2csv
Excel2Text
excel2txt
excel_template_autosize
Exception
Exception-Backtrace
Exception-Base
Exception-Caught
Exception-Chain
Exception-Class
Exception-Class-DBI
Exception-Class-Nested
Exception-Class-Sugar
Exception-Class-TCF
Exception-Class-Try-Catch
Exception-Class-TryCatch
Exception-Cxx
Exception-Delayed
Exception-Died
Exception-FFI-ErrorCode
Exception-Guaranteed
Exception-Handler
Exception-Like
Exception-Lite
Exception-NoException
Exception-Reporter
Exception-Reporter-Summarizer-Catalyst
Exception-Reporter-Summarizer-PlackRequest
Exception-Resumable
Exception-SEH
Exception-Simple
Exception-Sink
Exception-Stringy
Exception-System
Exception-ThrowUnless
Exception-Tiny
Exception-Warning
Exceptions
ExclusiveLock-Guard
Exherbo-Packager
Exim-SpoolMessage
Exobrain
Exobrain-Beeminder
Exobrain-Foursquare
Exobrain-HabitRPG
Exobrain-Idonethis
Exobrain-Twitter
Exodist-Util
ExPar
Expect
Expect-Simple
Expect.pm
Expense-Tracker
Experian-IDAuth
Experian-IDAutho
experimental
Experimental-TV
experimentals
ExpireDate
explain
Export-Attrs
Export-Declare
Export-Lexical
Export-These
Export-XS
ExportAbove
exported-constants
Exporter
Exporter-Almighty
Exporter-Attributes
Exporter-Auto
Exporter-AutoClean
Exporter-Cluster
Exporter-ConditionalSubs
Exporter-Constants
Exporter-Declare
Exporter-Declare-Magic
Exporter-Dispatch
Exporter-Easy
Exporter-Everything
Exporter-Extensible
Exporter-Handy
Exporter-Lexical
Exporter-LexicalVars
Exporter-Lite
Exporter-NoWork
Exporter-Proxy
Exporter-Renaming
Exporter-Rinci
Exporter-Simple
Exporter-Tidy
Exporter-Tiny
Exporter-VA
Exporter-WithBase
ExportTo
expr_eval
extensible_report_generator
ExtJS-AutoForm-Moose
ExtJS-Generator-DBIC
Extorter
extproc_perl
ExtUtils-Autoconf
ExtUtils-AutoInstall
ExtUtils-BuildRC
ExtUtils-BundleMaker
ExtUtils-CBuilder
ExtUtils-CChecker
ExtUtils-Command
ExtUtils-Config
ExtUtils-configPL
ExtUtils-Constant
ExtUtils-CppGuess
ExtUtils-CXX
ExtUtils-Depends
ExtUtils-DynaGlue
ExtUtils-DynaLib
ExtUtils-Embed
ExtUtils-ExCxx
ExtUtils-F77
ExtUtils-FakeConfig
ExtUtils-FakeMaker
ExtUtils-FindFunctions
ExtUtils-H2PM
ExtUtils-HasCompiler
ExtUtils-Helpers
ExtUtils-InferConfig
ExtUtils-Install
ExtUtils-InstallPAR
ExtUtils-InstallPaths
ExtUtils-LibBuilder
ExtUtils-MakeMaker
ExtUtils-MakeMaker-Attributes
ExtUtils-MakeMaker-BigHelper
ExtUtils-MakeMaker-Coverage
ExtUtils-MakeMaker-CPANfile
ExtUtils-MakeMaker-Dist-Zilla-Develop
ExtUtils-MakeMaker-Dump
ExtUtils-MakeMaker-Extensions
ExtUtils-MakeMaker-META_MERGE-GitHub
ExtUtils-MakeMaker-PPPort
ExtUtils-Manifest
ExtUtils-ModuleMaker
ExtUtils-ModuleMaker-PBP
ExtUtils-ModuleMaker-Siffra
ExtUtils-ModuleMaker-TT
ExtUtils-MY_Metafile
ExtUtils-nvcc
ExtUtils-ParseXS
ExtUtils-Peek
ExtUtils-PerlPP
ExtUtils-PkgConfig
ExtUtils-PL2Bat
ExtUtils-Scriptlet
ExtUtils-Signature
ExtUtils-SVDmaker
ExtUtils-TBone
ExtUtils-Typemap
ExtUtils-Typemap-Default
ExtUtils-Typemaps-Default
ExtUtils-Typemaps-Excommunicated
ExtUtils-Typemaps-Magic
ExtUtils-Typemaps-Signal
ExtUtils-Typemaps-STL-Extra
ExtUtils-XSBuilder
ExtUtils-XSpp
ExtUtils-XSpp-Plugin-Cloning
EyeTracking-EYD
EZDBI
EZID
Ezmlm
Ezmlm-Archive