NMatrix is a linear algebra library for Ruby, written mostly in C and C++.

This is an OmniAuth provider for Atlassian Crowd's REST API. It allows you to easily integrate your Rack application in with Atlassian Crowd.

MySQL Instrumentation Helpers for the OpenTelemetry framework

A Ruby frontend to the pdftk binary, including FDF and XFDF creation. Also works with the PDFTK Java port. Just pass your template and a hash of data to fill in.

The ruby client for Recurly's V3 API

Sablon is a document template processor. At this time it works only with docx and MailMerge fields.

Wiselinks makes following links and submitting some forms in your web application smarter and faster

ActiveRecord::JSONValidator makes it easy to validate JSON attributes with a JSON schema.

active_admin skin

Parse ignore files with Ruby

Code Obscure Tool.You can use it simplely

Foundation on Sass/Compass

Gruf instrumentation for the OpenTelemetry framework

Terjira is interactive and easy to use command line interface (or Application) for Jira. You do not need to remember resource key or id. Terjira suggests with interactive prompt.

JWT authentication for Warden, ORM agnostic and accepting the implementation of token revocation strategies.

This gem configures Rails for CloudFlare so that request.ip and request.remote_ip and work correctly.

Send notifications via hipchat, slack, IRC, and email

Provides basic framework for managing stateful processes with collins

Bit fields for ActiveRecord: This gem lets you use a single integer column in an ActiveRecord model to store a collection of boolean attributes (flags). Each flag can be used almost in the same way you would use any boolean attribute on an ActiveRecord object.

This gem allows you to easily use [Hashids](http://hashids.org/ruby/) in your Rails app. Instead of your models using sequential numbers like 1, 2, 3, they will instead have unique short hashes like "yLA6m0oM", "5bAyD0LO", and "wz3MZ49l". The database will still use integers under the hood, so this gem can be added or removed at any time.