Double Shot #2048

Slack-Term - Ditch the chrome and run Slack in a terminal session.
Firefox Configuration Guide for Privacy Freaks and Performance Buffs - Nothing ever works really right out of the box, does it?
The Little Book of Semaphores - Free ebook that introduces synchronization concepts with examples in Python.
LogAnalyzer - Produce summary information from Rails logs so you can see where your rendering hotspots are.
Server Timing Response Headers for Rails - Send server-side timings straight to Chrome Canary.