Standard Gems: Gemified in 3.0

The following libraries were made standard gems with Ruby 3.0.0

New Default Gems

New Default Gem	Description	Resources
abbrev	Finds the shortest unique abbreviation amongst many strings	RubyGems · GitHub · RDoc · CRuby
base64	Encodes and decodes strings to a Base64 representation. Implemented as a small wrapper around String#unpack	RubyGems · GitHub · RDoc · CRuby
debug	Command-line debugger	RDoc
digest c	Provides common hash functions like MD5, SHA1, SHA2, or RIPEMD-160	RubyGems · GitHub · RDoc · CRuby · JRuby (1)
drb	Distributed object system for Ruby	RubyGems · GitHub · RDoc · CRuby (1) · CRuby (2)
english	Readable aliases for special global variables	RubyGems · GitHub · RDoc · CRuby · JRuby
erb	Templating engine for Ruby	RubyGems · GitHub · RDoc · CRuby
find	Finds all files in a given directory and its sub-directories	RubyGems · GitHub · RDoc · CRuby
io-nonblock c	Allows to work with `IO` streams in a non-blocking way	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
io-wait c	Adds methods to wait until an `IO` stream becomes readable or writable	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
net-ftp	Support for FTP (File Transfer Protocol)	RubyGems · GitHub · RDoc
net-http	Support for HTTP (Hypertext Transfer Protocol)	RubyGems · GitHub · RDoc · CRuby (1) · CRuby (2) · CRuby (3) · JRuby (1) · JRuby (2) · JRuby (3)
net-imap	Support for IMAP (Internet Message Access Protocol)	RubyGems · GitHub · RDoc
net-protocol	Internal class for the other net-* libraries	RubyGems · GitHub · RDoc · CRuby · JRuby
nkf c	Kanji encoding converter. Can also be used via the Kconv.kconv method.	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
open-uri	Monkeypatches Kernel#open to support remote endpoints via `net/http` and `net/ftp`	RubyGems · GitHub · RDoc · CRuby
optparse	Command-line option parser	RubyGems · GitHub · RDoc · CRuby (1) · CRuby (2) · CRuby (3)
pathname c	Wraps `File`, `FileTest`, `Dir`, and `FileUtils` to ease working with file system paths	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
pp	The `pp` print debugging helper via `require 'pp'`. It will format the result object in more readable way.	RubyGems · GitHub · RDoc · CRuby · JRuby
prettyprint	Better object formatting and inspection. Also see the pp gem.	RubyGems · GitHub · RDoc · CRuby
racc c	Bindings for Racc, a YACC-like LALR(1) parser generator	RubyGems · GitHub · RDoc · CRuby (1) · CRuby (2)
resolv	Thread-aware DNS resolver	RubyGems · GitHub · RDoc · CRuby (1) · JRuby
resolv-replace	Will replace Socket's DNS with resolv	RubyGems · GitHub · RDoc · CRuby (1)
rinda	Support fot the Linda distributed computing paradigm in drb	RubyGems · GitHub · RDoc · CRuby
securerandom	Provides crpytographical randomness from openssl or the OS	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
set	Data structure for unordered collections without duplicates. Implemented on top of Hash. Also comes with `SortedSet` for ordered collections.	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
shellwords	Escape and manipulate commads to be run in the shell	RubyGems · GitHub · RDoc · CRuby
syslog c	Interface to the low-level syslog logger	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2) · JRuby (3)
tempfile	Simplifies OS independent creation of temporary files	RubyGems · GitHub · RDoc · CRuby · JRuby (1) · JRuby (2)
time	Adds more methods to `Time`	RubyGems · GitHub · RDoc · CRuby
tmpdir	Adds a `Dir.mktmpdir` method for creating temporary directories OS independently	RubyGems · GitHub · RDoc · CRuby · JRuby
tsort	Topological sorting using Tarjan’s algorithm, which finds strongly connected components in graphs	RubyGems · GitHub · RDoc · CRuby
un	Utilities to replace common UNIX commands	RubyGems · GitHub · RDoc · CRuby
weakref	Explicitly allow objects to be garbage collected	RubyGems · GitHub · RDoc · CRuby · JRuby
win32ole c	Windows OLE automation interface	RubyGems · GitHub · RDoc · CRuby · JRuby

Default Gems Removed

Removed Default Gem	Description	Resources
rexml	Support for XML (Extensible Markup Language)	RubyGems · GitHub · RDoc
rss	Support for RSS (Rich Site Summary) and Atom	RubyGems · GitHub · RDoc
sdbm c	Support for SDBM databases	RubyGems · GitHub · RDoc
webrick	HTTP Server	RubyGems · GitHub · RDoc

New Bundled Gems

New Bundled Gem	Description	Resources
rbs	Released with Ruby 3.0, RBS is a way to declare types in Ruby. The gem allows parsing and processing type definitions written in RBS.	RubyGems · GitHub · RDoc
rexml	Support for XML (Extensible Markup Language)	RubyGems · GitHub · RDoc
rss	Support for RSS (Rich Site Summary) and Atom	RubyGems · GitHub · RDoc
typeprof	Released with Ruby 3.0, typeprof allows you to automatically generate RBS type annotations	RubyGems · GitHub · RDoc

Bundled Gems Removed

Removed Bundled Gem	Description	Resources
net-telnet	Support for Telnet	RubyGems · GitHub · RDoc
xmlrpc	Remote Procedure Calls via XML and HTTP	RubyGems · GitHub · RDoc

More Standard Gems

General information about standard gems
Gem list for Ruby: 3.3.0 (preview)
Gem list for Ruby: 3.2.2 · 3.2.1 · 3.2.0
Gem list for Ruby: 3.1.4 · 3.1.3 · 3.1.2 · 3.1.1 · 3.1.0
Gem list for Ruby: 3.0.6 · 3.0.5 · 3.0.4 · 3.0.3 · 3.0.2 · 3.0.1 · 3.0.0
Gem list for Ruby: 2.7.8 · 2.7.7 · 2.7.6 · 2.7.5 · 2.7.4 · 2.7.3 · 2.7.2 · 2.7.1 · 2.7.0
Gem list for Ruby: 2.6.10 · 2.6.9 · 2.6.8 · 2.6.7 · 2.6.6 · 2.6.5 · 2.6.4 · 2.6.3 · 2.6.2 · 2.6.1 · 2.6.0
Gem list for Ruby: 2.5.9 · 2.5.8 · 2.5.7 · 2.5.6 · 2.5.5 · 2.5.4 · 2.5.3 · 2.5.2 · 2.5.1 · 2.5.0
Gem list for Ruby: 2.4.10 · 2.4.9 · 2.4.8 · 2.4.7 · 2.4.6 · 2.4.5 · 2.4.4 · 2.4.3 · 2.4.2 · 2.4.1 · 2.4.0
Gem list for Ruby: 2.3.8 · 2.3.7 · 2.3.6 · 2.3.5 · 2.3.4 · 2.3.3 · 2.3.2 · 2.3.1 · 2.3.0
Gem list for Ruby: 2.2.10 · 2.2.9 · 2.2.8 · 2.2.7 · 2.2.6 · 2.2.5 · 2.2.4 · 2.2.3 · 2.2.2 · 2.2.1 · 2.2.0
Compare versions: Main Rubies · Supported Rubies · All Rubies · 3.2 · 3.1 · 3.0 · 2.7 · 2.6 · 2.5 · 2.4 · 2.3 · 2.2
Gemified in: 3.2 · 3.1 · 3.0 · 2.7 · 2.6 · 2.5 · 2.4 · 2.3 · 2.2
List of Non-Gem Default Libraries
List of Unmaintained Default Gems
List of Removed Standard Gems