Using this plugin you can use Factory Girl to test your formastic forms of active admin .

Adds some simple formatting to the standard Rails BufferedLogger class. This solution aims to be something between the default logging which is missing information such as timestamps, process IDs and severity levels and a full logging solution like log4r

A Rails Engine that restricts the formats that your Rails controller actions are allowed to process.

Rails form helper the generates Bootstrap 2 markup

This gem simply overrides the method_missing of ActiveSupport::TimeWithZone module and includes the functionality for responding to various methods that will retrieve a time stamp in required format.

Complex format validators

[DEPRECATED - see bootstrap_form] Provides a builder that makes it super easy to take advantage of Twitter Bootstrap (version 1.4) forms styles.

FormBoy - fetch me that form!

A simple form gem

FormEase is a extension for gem simple_form

A form object that really wants to be a form object.

This gem for Ruby on Rails 4.0+ allows to create blocks for each field of the form. This allows to simplify syntax, show errors, add errors classes and validation attributes.

FormGuard provides a simple way to prevent bot form submissions in Rails applications using honeypot fields and timestamp-based validation.

A Ruby API wrapper for formi9.com

Formify acts as an abstract class, allowing you to easily create robust form objects and test them using rspec.

A gem for Ruby on Rails which wraps up functionality of maintaining values for forms to factor cases where a POST fails model validation while also providing a means to succinctly produce relevant error messages.

Adds some form helper to Rails (>= 3.2).

Create multi page form using Rails

A library reflex to provide realtime form validation using the validations you already have

Makes it easier to relay received POST params for further POSTing. This is ideal if you want to insert an intermediate page during POSTing, such as an order confirmation page.