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.

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 ever found Ruby memory environment variables on a web page and used them to try to speed up your app, this is a better approach.

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

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

Erlang External Term Format (ETF) for Ruby

Generate error pages for Rails applications

Use esbuild to compress your Rails CSS

Estimate project size

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.

Callback-less event reactor for Ruby

Symbol#to_proc's hot cousin. Simple and elegant alternative to using &:method with enumerables.

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

Think of Executable as a COM, a Commandline Object Mapper, in much the same way that ActiveRecord is an ORM. A class utilizing Executable can define a complete command line tool using nothing more than Ruby's own method definitions.

Retrieves stored config for Exercism

exhale is the contraction toolkit for the exhale of every pull request in a Rails app. Its first check, exhale dry, sweeps the whole codebase for duplicated Ruby and ERB, scores near-copies by rarity-weighted structural similarity, and fails the build while any copy is undeclared. Deliberate duplication is declared in the Contract, next to the reason for it. Built on Prism and Herb.