natto provides a naturally Ruby-esque interface to MeCab. It runs on both CRuby (mri/yarv) and JRuby (jvm). It works with MeCab installations on Windows, Unix/Linux, and OS X. No compiler is necessary, as natto is not a C extension.

Nested scaffold generator for Rails

A Rails engine providing a web dashboard for monitoring and managing one or multiple PgBouncer connection poolers.

Sync users and groups from LDAP to PostgreSQL

Pippi is a utility for locating suboptimal Ruby class API usage.

Adds missing native PostgreSQL data types to ActiveRecord and convenient querying extensions for ActiveRecord and Arel

Prawn/QRCode simplifies the generation and rendering of QRCodes in Prawn PDF documents.

A declarative DSL for building filters and sorts with Rails and Active Record

If the user clicked through from an affiliated site, this middleware will track affiliate tag, referring url and time.

Simple gem to translate routes in Rails 3.x based on translate_routes

Adds the ability to pull random records from ActiveRecord

Refrigerator freezes all core classes. It is designed to be used in production, to make sure that none of the core classes are modified at runtime. It can also be used to check libraries to make sure that they don't make unexpected modifications/monkey patches to core classes.

Open local or remote XLSX, XLS, ODS, CSV (comma separated), TSV (tab separated), other delimited, fixed-width files, and Google Docs. Returns an enumerator of Arrays or Hashes, depending on whether there are headers.

RequestLocals gives you per-request global storage in Rails

Tracks jobs performed, failed, and the duration of the last 100 jobs for each job type.

High-performance logger of Ruby method invocations

A pure Ruby implementation of a useful subset of Prolog.

Sass compiler and Sinatra routing for SassMeister.com

An interface for creating feature-driven operations.

Utility function to efficiently merge Tailwind CSS classes without style conflicts.