cheat sheets.

fastercsv
gruff
haml
rubyzip
doodle
facets
fastri
hpricot
image_science
json
json_pure
mongrel
openwferu
rack
ruby-debug
ruby-prof
RubyInline
sqlite3-ruby
turing: for CAPTCHA(colorful_spiral.rb)
wirble: colorize the console
ZenTest

parseexcel
roo

pdf-writer

# Taskr is a stand-alone HTTP daemon, providing a cron-like networked
# scheduling service. Tasks are created and managed via a REST calls over
# HTTP, allowing other REST-aware services to schedule and manage jobs.

# One common use for Taskr is to schedule jobs to be executed on 
# remote Rails servers. However, Taskr is a far more generic tool, 
# capable of performing a wide range of scheduled actions.

Varnish:
  It is a state-of-the-art, high-performance HTTP accelerator.