KLayout is a free open source layout editor. Examples for KLayout (E4K) is a set of scripts that run on KLayout to showcase KLayout's functionality or to teach KLayout scripting in the Ruby language. Try it out!
(KLayout also offers Python scripting, though this is not yet part of E4K.)
Another similar project is The Red Toolbox (a.k.a. TRT; http://sourceforge.net/p/theredtoolbox). TRT is intended to be a toolbox of useful macros that you would actually use during layout, while E4K scripts allow you to learn more general principles of scripting but may not be as useful as-is in your workflow.
To install, copy this folder structure to your 'macros' directory. so all the subfolders will be inside C:\User\username\KLayout\macros\Examples, or similar for linux. Restart KLayout and look for the "Examples" menu at the top. If you have a previous version installed, delete that Examples folder and replace it with the new one.
Examples for KLayout
A set of example macros for KLayout (klayout.de)
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davidnhutch
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