Make it easy to upsert on MySQL, PostgreSQL, and SQLite3. Transparently creates merge functions for MySQL and PostgreSQL; on SQLite3, uses INSERT OR IGNORE.

Ruby client for memcached supporting advanced protocol features and pluggable architecture.

Active Record caching and indexing in memcache.

Store the version of any class for cache invalidation

Easy manipulation of sets of ActiveRecord models

Support for PostgreSQL's ts_vector data type in ActiveRecord. Perfect for indexing tags, arrays etc.

cawcaw RubyGem

Geospatial MetaData ToolKit for use in a GeoHydra head

Takes care of defining what actions one model is allowed to do with another model.

A simple Sphinx indexing library for Ruby

Easy Postgres replication for Rails

A simple RSpec formatter to enable writing RSpec test results to any database using ActiveRecord

Generate uuids for models