Rails plug-ins are code packages that can be added to a Rails application. Unlike gems, which are part of the system and can be invoked by multiple applications, plug-ins are installed as part of an individual Rails application.
A Rails plugin that is a drop-in replacement for Rails Action Caching. Adds many useful features including: last-modified header usage, storing response headers in cache, custom cache key implementations, conditional caching, and more.
Plugin for high performance caching. From the site description: “Interlock uses memcached to make your view fragments and associated controller blocks march along together. If a fragment is fresh, the controller behavior won’t run. This eliminates duplicate effort from your request cycle. Your controller blocks run so infrequently that you can use regular ActiveRecord finders and not worry about object caching at all.”
Here’s where to find all the plugins that used to be in Rails but were pushed out for Rails 2, such as acts_as_list, acts_as_tree, and scaffolding. You’ll also find other plugins that were never in the framework but have come from the core team, such as exception_notification and ssl_requirement.
github home of the action_mailer_optional_tls plugin. Use this plugin to connect to Google GMail from your Rails app. Pay attention to Googles TOU, as there are limits to the number of email messages you can send in one day.
This plugin adds easily accessible debug information
into your views. It adds a button that will pop up a
new window that displays request parameters, session variables, flash variables, and assigned template variables.
A plugin that replaces the view code produced by the standard Rails scaffold with a view that explicitly references each column, rather than iterating over all the columns, so it is much easier to customize.
Plugin that shows a simple toolbar over Textile text-entry areas, so you can, for example, click a Word-like “B” icon for bold and it will wrap the selected text in asterisks. (Display is still not wysiwyg, however.)