Rake
One-off tasks that make the business hum
Rake
Redis
O(N) in-memory set operations? Yes, please!
Redis
Rspec
I don't think that method does what you think it does.
Rspec
Travis CI
What's the point of all those tests if you don't run them?
Travis CI
HTML5
The interwebs done gone and grow'd up *tear*
HTML5
jQuery
Rich web apps since before AJAX had a name
jQuery
Sinatra
Don't use a machete when you need a scalpel. (hint: Sinatra's the scalpel)
Sinatra
Resque
If it takes more than a blink of the eye to run, it should probably be queued.
Resque
RVM
Create boundaries between your applications
RVM
OSX
Friendly UI + UNIX Terminal = Developer's Best Friend
OSX
Cron / Scheduler
Automate those pesky tasks so you can go on to do better things
Cron / Scheduler
Bundler
Ever tried to manage gems by hand? *shudders*
Bundler
Pusher
Real-time apps with web sockets are super neat
Pusher
Twilio
Give your app the ability to prank call people
Twilio
Mandrill
Let your app reply to emails like it was people
Mandrill