EnhancedErrors will automatically enhance your errors with messages containing variable values from the moment they were raised, using no extra dependencies, and only Ruby's built-in TracePoint.

EnumeratedField is a library that provides some nice methods when a string column is used like an enumeration, meaning there is a list of allowable values for the string column.

Simple enumerated types

Adds support for creating enum state machines for attributes on any Ruby class

EnvMem allows you to dump your GC.stat information from a long-running server, then produce a simple shellscript to set up your Ruby memory environment variables to match that configuration. This improves startup time slightly and allows you finer-grain control over your memory setup. If you've e...

Access environment variables. Also includes presence validation, type coercion and default values.

An implementation of the Lexrank Algorithm, which summarize corpus of text documents.

Generate error pages for Rails applications

Use esbuild to compress your Rails CSS

SDK for interacting with the ESP API.

Estimate project size

A ruby library to generate ETH addresses from a Hierarchical Deterministic wallet according to the BIP32 standard.

Eukaliptus is a set of helpers and bug fixes for browsers to help you build Facebook iframe applications or user fan tabs.

Europe is a simple library for retrieving EU government data such as VAT information, VAT validation, currency exchange rates and country information.

Eventbox is a model of concurrent computation that is used to build thread-safe objects with arbitrary interfaces. It is [kind of advancement](#comparison-threading-abstractions) of the well known [actor model](https://en.wikipedia.org/wiki/Actor_model) leveraging the possibilities of the ruby la...

Interface with EveryPolitician data from your Ruby app

Makes it easy to work with EveryPolitician's Popolo output files from Ruby

Excon, with Hypermedia traversing baked in.

An ExecJS node runtime which uses pipes to avoid repeated startup costs

Retrieves stored config for Exercism