The git gem provides an API that can be used to create, read, and manipulate Git repositories by wrapping system calls to the git command line. The API can be used for working with Git in complex interactions including branching and merging, object inspection and manipulation, history, patch generation and more.

A fast, safe and extensible Markdown to (X)HTML parser

A pure Ruby implementation of the SCP client protocol

Render components in views or controller actions. Server-side rendering powered by ExecJS. Transform JSX in the asset pipeline or use Shakapacker.

FastImage finds the size or type of an image given its uri by fetching as little as needed.

ActiveModel/Record integrations for Elasticsearch.

Wicked PDF uses the shell utility wkhtmltopdf to serve a PDF file to a user from HTML. In other words, rather than dealing with a PDF generation DSL of some sort, you simply write an HTML view as you would normally, and let Wicked take care of the hard stuff.

Amazon S3 output plugin for Fluentd event collector

Ruby on Rails integrations for Elasticsearch.

A Rack app that provides request/response rewriting proxy capabilities with streaming.

Filter plugin to add Kubernetes metadata

When a Cucumber step fails, it is useful to create a screenshot image and HTML file of the current page

Elasticsearch output plugin for Fluent event collector

**Logging** is a flexible logging library for use in Ruby programs based on the design of Java's log4j library. It features a hierarchical logging system, custom level names, multiple output destinations per log event, custom formatting, and more.

Persistence layer for Ruby models and Elasticsearch.

Gettext is a GNU gettext-like program for Ruby. The catalog file(po-file) is same format with GNU gettext. So you can use GNU gettext tools for maintaining.

All the stuff that isn't good/big enough for a real library.

Rack middleware which aborts requests that have been running for longer than a specified timeout.

Get memory usage of a process in Ruby

EventMachine implements a fast, single-threaded engine for arbitrary network communications. It's extremely easy to use in Ruby. EventMachine wraps all interactions with IP sockets, allowing programs to concentrate on the implementation of network protocols. It can be used to create both network servers and clients. To create a server or client, a Ruby program only needs to specify the IP address and port, and provide a Module that implements the communications protocol. Implementations of several standard network protocols are provided with the package, primarily to serve as examples. The real goal of EventMachine is to enable programs to easily interface with other programs using TCP/IP, especially if custom protocols are required.