Jekyll Jupyter Notebook plugin adds [Jupyter](http://jupyter.org/) Notebook support to Jekyll. You can embed Jupyter Notebooks into your texts.

Google Maps support in Jekyll blog to easily embed maps with posts' locations

JSON-RPC 2.0 client and server

The JitPreloader has the ability to send notifications when N+1 queries occur to help guage how problematic they are for your code base and a way to remove all of the commons explicitly or automatically

Log transitions on a state machine to support auditing and business process analytics.

Helpers for validating JSON API payloads

Returns the difference between two JSON files

Build complex rules, serialize them as JSON, and execute them in ruby. See http://jsonlogic.com

Jump consistent hash implementation for Ruby

KPeg is a simple PEG library for Ruby. It provides an API as well as native grammar to build the grammar. KPeg strives to provide a simple, powerful API without being too exotic. KPeg supports direct left recursion of rules via the {OMeta memoization}[http://www.vpri.org/pdf/tr2008003_experimen...

A kramdown extension for converting Markdown documents to AsciiDoc.

Rails drop in for Varnish support.

The command line interface to Learn.co.

The command line interface to Learn.co.

Liquid performance extension in C

Automatic Localizable file generation for multiple platforms

A gem with tools for machine learning.

A ruby library for working with Machine Readable Cataloging

Use the same simple commandline api to manage cloud interfaces

A MediaElement gem(engine) for Rails. Makes embedding HTML5 video easy.