Fast ASM (Approximate String Matching) by calucuating edit distance within the collecitons such as ZSET, HASH, LIST, SET on Redis using Lua script. It provides you to search multi-byte characters correctly, because it recognizes lead-byte of UTF-8 strings.

Nearest neighbor search for Ruby and Redis

Manateq - a handy library for searching and listing regions, cities and districts in Saudi Arabia

Wolfram|Alpha introduces a fundamentally new way to get knowledge and answers — not by searching the web, but by doing dynamic computations based on a vast collection of built-in data, algorithms, and methods.

Uses KMeans clustering and the L*A*B* colorspace to extract "approximate human vision" dominant colors from an image. Optionally, use Euclidean Distance to map those dominant colors into preferred "color bins" for a search index facet-by-color solution.

An ellen handler to search images from Google.

The binary search algorithm is extracted from Jon Bentley's # Programming Pearls 2nd ed. p.93

Finds RSpec test ordering bugs

Search and view Blacklight resources on a map.

Allow search and fast creation of records in selectors (by select2 plugin) in ActiveAdmin with Formtastic. It useg modal forms for new records submitted using AJAX

Allows you to search and get information about movies from rottentomatoes.com. Organizes returned information into easy to access attributes.

An unofficial DuckDuckGo search API.

A simple daemon that polls for updated Twitter statuses, Summize search results, and RSS/Atom feed items and posts them to a Campfire room.

Color search for Rails

This gems lets you access to the search and get current conditions features.

Ion is a library that lets you index your records and search them with simple or complex queries.

Merb plugin that provides access to the Ruby Xapian search engine library

Client for the Search/Retrieve via URL (SRU) protocol. http://www.loc.gov/standards/sru/

RDoc plugin to generate markdown documentation and search index as sqlite database for entire content.

Search hosts on AWS EC2