Storing configuration in the environment is one of the tenets of a twelve-factor app. However, problems arise when required environment variables aren't set.

A simple wrapper around the ENV hash that by default raises an error when value requested is not set.

Envkey secures and simplifies configuration and secrets management.

Gem for dealing with epay.bg payments.

Ephemeral lets you define one-to-many relationships between in-memory objects, with ORM-like support for where clauses and chainable scopes.

Generates a template directory that you can use to build a custom epub. After customizing templates, use bin/gen_epub.rb to create and validate an epub archive.

A gem to evaluate mathematical equations. Includes support for variables and functions.

Generate documents from a scope, ERB template(s) and Hiera data

Erector is a Builder-like view framework, inspired by Markaby but overcoming some of its flaws. In Erector all views are objects, not template files, which allows the full power of object-oriented programming (inheritance, modular decomposition, encapsulation) in views.

A simple Ruby library that lets you manage your Mountebank test server.

Connects Mejuri with third-party ERP vendors

Errand provides Ruby bindings for RRD functions (via rrd-ffi), and a concise DSL for interacting with RRDs.

Uses the asset pipeline to generate your static error pages.

This gem provides implements instrumentation with Errplane for Rails 2.3.x and 3.x applications.

A simple HTTP and REST client for Ruby, inspired by the Sinatra microframework style of specifying actions: get, put, post, delete.

Escher helps you creating secure HTTP requests (for APIs) by signing HTTP(s) requests.

Elasticity provides a higher level abstraction on top of [elasticsearch-ruby](https://github.com/elasticsearch/elasticsearch-ruby) gem

Ruby wrapper for ESLint. Uses ExecJS

Validate requests and responses against API Blueprint specifications

Build a query hash by a simple query string