First Gem: jekyll-onebox
on Jekyll, Ruby
I published my first Ruby gem. The Liquid tag jekyll-onebox allows to display HTML previews (embeds) for links to popular websites.
Initially, I wanted to blog about my travels. In the end, I refactored old code on my computer to publish eventually my first Ruby gem in the official repo at RubyGems. Welcome now jekyll-onebox on Github and RubyGems! 
So if you use Jekyll for blogging, you can install this plugin and add HTML previews for links to popular websites very easily.
{% onebox https://github.com/rriemann/jekyll-onebox/blob/master/README.md %}
The previews are rendered using the gem onebox that powers link previews for Discourse forums.
Have fun with it and let me know if you encounter problems!