GitLab is a GitHub-like repositories hosting script that allows you to host repositories on your own server.

This is a very welcome project, because, you know, the clients are often very picky as to where the project will be hosted during development, and thus making collaboration nearly impossible.

GitLab runs on Ruby on Rails, and is free to download and distribute under the liberal MIT license.

• Website: http://gitlabhq.com/

Mercury Editor is a WYSIWYG HTML5 editor built on Rails.

Mercury has loads of useful features, the main, of course, being WYSIWYG HTML editing. But there’s more:

• Link tools;
• Media tools (insert videos, images, audio, etc.)
• Table editing;
• Snippets;
• Custom HTML.

• Website: http://jejacks0n.github.com/mercury/

Rack-webconsole is a in-browser console will help you to debug your Ruby on Rails applications. Rack-webconsole provides a Javascript-powered bridge to your Ruby application by using jQuery.

If you are using Rails 3 you don’t need to load jQuery because it’s loaded by default. After you have installed the gem you only have to include the gem in your Gemfile and it already works, without any configuration.

To fire up the console, just press the ` (backtick) key.

Rack-webconsole has been tested with MRI versions 1.8.7, 1.9.2, ruby-head, and JRuby 1.6.3.

• Website: http://codegram.github.com/rack-webconsole

The Ruby Toolbox gives you an overview of Ruby tools, sorted in categories and rated by the amount of watchers and forks in the corresponding source code repository on GitHub so you can find out easily what options you have and which are the most common ones in the Ruby community.

• Website: http://ruby-toolbox.com/

Locomotive is an Open-source Ruby on Rails CMS, which integrates seamlessly with Amazon S3 and Heroku data services.

Locomotive is still in its infancy, but already has a significant potential.

What you’ll like about Locomotive:

• Support multiple sites from the same installation.
• Cloud services make Locomotive ridiculously cheap for hosting countless sites.
• Awesome design. Even the backend is pure eye candy.
• Support for numerous data types.

What you won’t like:

• Still in the beta, prone to errors. It appears stable, however.
• Two templates.

• Website: http://locomotivecms.com/
• Demo: http://demo.locomotivecms.com/admin

ClientSideValidations is a Ruby gem that allows easy form validation on client side.

Before this gem, you had to re-define the validation rules on the client’s side

However, ClientSideValidations eases validation by avoiding an additional validation rule definition on client’s side.

The data is sent from your model to the client in JSON and bound to a form through an automatically configured jQuery form validator.

• Website: http://github.com/dnclabs/client_side_validations