Ok, I should have done my home work last week end :). Let’s have a look for what I have found these last few days :

• erubis: it’s a VM for ruby written in ruby. Rails is supported in the latest version. Have also for java-er
• ActiveScaffold: do you know about AjaxScaffold ? ActiveScaffold is the new version (v4) of this plugin. Don’t need to generate controller anymore, every thing is in methods.
• : if you are looking for some nice web2.0 features as the thickbox in your rails application look at this plugin. I will try to do an article soon about its use as it ’s not fully documented
• acts_as_authenticated plugin: great plugin for managing users and authentication. Has many other plugins use it for authorization by example. Excellent documentation on the wiki
• sitemeter: another great plugin, easy to install, let’s you have statistics on your rails application. Have a look.
• globalize: not yet tested, a plugin for i18nalize your application