A Jekyll plugin to add metadata tags for search engines and social networks to better index and display your site's content.

rdoc generator html with javascript search index.

Airbrake is an online tool that provides robust exception tracking in any of your Ruby applications. In doing so, it allows you to easily review errors, tie an error to an individual piece of code, and trace the cause back to recent changes. The Airbrake dashboard provides easy categorization, searching, and prioritization of exceptions so that when errors occur, your team can quickly determine the root cause. Additionally, this gem includes integrations with such popular libraries and frameworks as Rails, Sinatra, Resque, Sidekiq, Delayed Job, Shoryuken, ActiveJob and many more.

Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results. This gem integrates Select2 with Rails asset pipeline for easy of use.

Blacklight is an open source Solr user interface discovery platform. You can use Blacklight to enable searching and browsing of your collections. Blacklight uses the Apache Solr search engine to search full text and/or metadata.

Sunspot::Rails is an extension to the Sunspot library for Solr search. Sunspot::Rails adds integration between Sunspot and ActiveRecord, including defining search and indexing related methods on ActiveRecord models themselves, running a Sunspot-compatible Solr instance for development and test environments, and automatically commit Solr index changes at the end of each Rails request.

GeoIP searches a GeoIP database for a given host or IP address, and returns information about the country where the IP address is allocated, and the city, ISP and other information, if you have that database version.

Amatch is a library for approximate string matching and searching in strings. Several algorithms can be used to do this, and it's also possible to compute a similarity metric number between 0.0 and 1.0 for two given strings.

Sunspot is a library providing a powerful, all-ruby API for the Solr search engine. Sunspot manages the configuration of persistent Ruby classes for search and indexing and exposes Solr's most powerful features through a collection of DSLs. Complex search operations can be performed without hand-writing any boolean queries or building Solr parameters by hand.

PgSearch builds Active Record named scopes that take advantage of PostgreSQL's full text search

Allows simple search forms to be created against an AR3 model and its associations, has useful view helpers for sort links and multiparameter fields as well.

Search Engine Optimization (SEO) plugin for Ruby on Rails applications.

A Rubyesque interface to Gmail, with all the tools you will need. Search, read and send multipart emails; archive, mark as read/unread, delete emails; and manage labels.

Tire is a Ruby client for the Elasticsearch search engine/database. It provides Ruby-like API for fluent communication with the Elasticsearch server and blends with ActiveModel class for convenient usage in Rails applications. It allows to delete and create indices, define mapping for them, supports the bulk API, and presents an easy-to-use DSL for constructing your queries. It has full ActiveRecord/ActiveModel compatibility, allowing you to index your models (incrementally upon saving, or in bulk), searching and paginating the results. Please check the documentation at <http://karmi.github.com/retire/>.

An intelligent layer for ActiveRecord (via Rails and Sinatra) for the Sphinx full-text search tool.

Uniquely powerful server-side searching, sorting and filtering of any ActiveRecord or Array collection as well as post-rendered content displayed as a frontend jQuery Datatable

A(nother) HTML(5) generator for RDoc. It uses {Twitter Bootstrap}[http://twitter.github.com/bootstrap/] for the pretty, doesn't take up valuable horizontal real estate space with indexes and stuff, and has a QuickSilver-like incremental searching.

A Ruby API and configuration helper for the Sphinx search service.

Google Search API

Ferret is a super fast, highly configurable search library.