Dynamoid is an ORM for Amazon's DynamoDB that supports offline development, associations, querying, and everything else you'd expect from an ActiveRecord-style replacement. Make sure you add require 'dynamoid' to before your configure script with adept_dynamoid

Ruby persistence layer for CouchDB

Add social network friendship features to your Active Record models.

The goal of NoBrainer is to provide a similar interface compared to ActiveRecord and Mongoid to build data models on top of RethinkDB while providing precise semantics.

ActionView Record Tag Helpers

Searchlight is a low-magic way to build database searches using an ORM. It's compatible with ActiveRecord, Sequel, Mongoid, and any other ORM that can build queries by chaining method calls.

This gem identifies valid tracking numbers and the service they're associated with. It can also tell you a little bit about the package purely from the number—there's quite a bit of info tucked away into those numbers, it turns out.

Rails for zurb foundation CSS framework. Form builder, flash message, ...

ActiveValidators is a collection of ActiveModel/ActiveRecord validations

Check password strength against several rules. Includes ActiveRecord/ActiveModel support.

Adds zipcode validation methods to ActiveModel considering different country zipcode formats.

Model and repository framework

In memory DB using ActiveModel

ActiveFedora provides for creating and managing objects in the Fedora Repository Architecture.

A gem/plugin for Rails 3+ that enables client-side validation using ActiveModel + HTML5

reCAPTCHA was too much for us, so we created this. Simplest captcha ever.

This gems works with devise to provide backend password strength checking via zxcvbn-js to reject weak passwords

OOOR exposes OpenERP business object proxies to your Ruby (Rails or not) application. It extends the standard ActiveResource API. Running on JRuby, OOOR also offers a convenient bridge between OpenERP and the Java eco-system

ActiveRecord/Mongoid enums with i18n

Generate Ruby models from Avro schemas