hedron alternatives and similar shards

Based on the "GUI library" category.
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README

Hedron is an easy-to-use, OOP Crystal GUI library, that allows you to do the following:

Create your own UI classes ("widgets") that fully integrate with existing classes
A markup language (with extension .hdml), which makes creating UI easy
Full integration with custom widgets and HDML, so you can inject your own widgets into your markup

Hedron is under active development, so check back often!

Follow the instructions for installation laid out in andlabs/libui.
Copy the compiled files from step 1 (i.e. files in build/out) to /usr/lib for OSX and Linux users.
Go to your shard.yml file, and enter this in:

dependencies:
  hedron:
    github: hedron-crystal/hedron
    version: 0.1.0