Really fun simulation game about building a video game company. Old school graphics but a ton a fun. Looks like there is an Android version too.
ProxyLocal
Makes your local web server publicly available over the internet. Would be good for testing webhooks or callback code.
jsFiddle – online JavaScript REPL
mountain_goat
Advanced Rails A/B testing and analytics library.
blueprint
Reverse engineer server configuration into puppet or chef.
In-memory SQLite database for Rails testing
Saw a significant speed improvement in my code with this (~20-30% on a 30 minute suite). Really useful if you have a lot of memory or slower disks.
From Emili Parreño
Remove references to yourself
It’s not what you read, it’s what you ignore
Best part: you have a finite number of keystrokes before you die.