gems

abbrev
addressable
base64
benchmark
bigdecimal
bundler
cgi
clocale
colorls
csv
date
debug
delegate
did_you_mean
digest
drb
english
erb
error_highlight
etc
fcntl
fiddle
filesize
fileutils
find
forwardable
getoptlong
io-console
io-nonblock
io-wait
ipaddr
irb
json
logger
manpages
matrix
minitest
mutex_m
net-ftp
net-http
net-imap
net-pop
net-protocol
net-smtp
nkf
observer
open-uri
open3
openssl
optparse
ostruct
pathname
power_assert
pp
prettyprint
prime
prism
pstore
psych
public_suffix
racc
rainbow
rake
rbs
rdoc
readline
reline
resolv
resolv-replace
rexml
rinda
rss
ruby2_keywords
securerandom
set
shellwords
singleton
stringio
strscan
syntax_suggest
syslog
tempfile
test-unit
time
timeout
tmpdir
tsort
typeprof
un
unicode-display_width
uri
weakref
yaml
zlib