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Ruby User Group Berlin
Ruby Unconf Hamburg, 5th + 6th of May
A simple yet powerful HTTP client for JRuby
A revolutionary idea: why not use a job queue system for your job queue?
Ruby on small devices
Let’s build a CPU with Ruby!
Taming memory: performance-tuning a (Crystal) application
February Meetup 2014
April Meetup 2015
November Meetup 2015