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.

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

Store the version of any class for cache invalidation

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 manipulation of sets of ActiveRecord models

Easy Postgres replication for Rails

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

Generate uuids for models