If you like the straight forward and effective nature of Strong Parameters and suspect that CanCan might be overkill for your project then you'll love Petergate's easy to use and read action and content based authorizations.

Adds missing native PostgreSQL data types to ActiveRecord and convenient querying extensions for ActiveRecord and Arel

Easily write arbitrary filters

A lightweight cron scheduler for the Que async job worker

Declaratively filter data via URL params, in any Rack app.

The Let's Encrypt certificate manager for rails

Adds the ability to pull random records from ActiveRecord

Record Cache for Rails 3

A modern fast tagging framework for Rails 3.1+

Better support for legacy database schemas for ActiveRecord, such as columns named class, or any other name that conflicts with an instance method of ActiveRecord.

A smart sms verification tool

State machine that allows dynamic transitions for business workflows

Sharding

Introspects your database string field maximum lengths and automatically defines length validations.

Rails way to harness the power of SQL "EXISTS" statement

Subscribe to changes on ActiveRecord models

ActiveRecord/Rails Integration for the Workflow library. Workflow is a finite-state-machine-inspired API for modeling and interacting with what we tend to refer to as 'workflow'.

Backported from Rails 5.0 to use with 4.x versions

Simulate multi-table inheritance for activerecord models using a polymorphic association

Recursively traverse trees using a single SQL query