Hash-version of Array's map method that is recursive and works on keys and values simultaneously.

Performs pruning or one-level promotion of Hash attributes (typically labeled "private:"), and deep merges and joins of Hash objects. Works on Array objects containing Hash objects as well.

Toolkit for working with Hashes

Nice DSL to convert hash structure to different one.

a gem to check whether given to hashes are of the same format

Custom fields forActiveRecord models, suppport Rails 4!

Keep specified associations in sync with ease using async reindexing (searchkick gem is required).

Uses Chronic to parse incoming dates and does not raise errors on invalid multi parameter settings

Hoff up your desktop.

Easily track streaks on your ActiveRecord models.

Hasten the import of mysql dumps, especially those containing very large innodb tables with multiple indexes.

Prototype Gosu games with ease

Hatenablog AtomPub API library

A Notification Management Tools

Hazelcast::Client is a little gem that wraps the Java Hazelcast Client library into a more comfortable JRuby package.

This gems helps you exporting your pictures from huaban.com.

A fluentd input plugin that collects node and container metrics from a kubernetes cluster.

HetznerCloud native Ruby client

HDLRuby is a library for describing and simulating digital electronic systems. With this library it will possible to describe synthesizable hardware using all the features of the Ruby language, e.g., object orientation, duck typing, closure. This library is also usable through irb for interactive...

HdrHistogram is an algorithm designed for recording histograms of value measurements with configurable precision. Value precision is expressed as the number of significant digits, providing control over value quantization and resolution whilst maintaining a fixed cost in both space and time.