Decreases the need to write integration tests by ensuring that the things you stub or mock actually exist.

Create, manage, and send scheduled email sequences and drip campaigns from your Rails app.

Safe destroy for ActiveRecord.

Garner is a cache layer for Ruby and Rack applications, supporting model and instance binding and hierarchical invalidation.

Provides support for using versioning gems such as PaperTrail with Globalize.

Referencing code in app/ from a database migration risks breaking the migration when your app code changes; this gem prevents that mistake

Adds group and membership functionality to Rails models

Shield sensitive data in Postgres and MySQL

A faster, lower-memory, fuller-featured querying API for ActiveRecord that returns results as unadorned, read-only objects.

Add support for master/slave database database clusters in ActiveRecord to improve performance.

Search object DSL

Provides enhancements to ActiveRecord to handle spatial datatypes in PostgreSQL and MySQL.

A gem that provides a client interface for getstream.io

ActiveRecord/Mongoid enums with i18n

Set transaction isolation level in the ActiveRecord in a database agnostic way. Works with MySQL, PostgreSQL and SQLite as long as you are using new adapters mysql2, pg or sqlite3. Supports all ANSI SQL isolation levels: :serializable, :repeatable_read, :read_committed, :read_uncommitted.

Translation Center is a multi lingual web engine for Rails 3 apps. It builds a translation center community with translators and admins from your system users.

uffizzi_core

Easing the form object pattern in Rails applications.

Import tabular data from spreadsheets or similar sources into data models

Amazon Redshift _makeshift_ adapter for ActiveRecord 4.