Knowledge Base is a bunch of models for Ruby on Rails that you probably need to build your own

Landing page storage, rendering, tracking, and management API

Maestrano is the next generation marketplace for SME applications. See https://sme.maestrano.com for details.

Web UI for MailyHerald - Email processing solution for Ruby on Rails applications

A small and simple efficient extension to Monologue that replace the default WYSIWYG editor with a Markdown editor.

OkuribitoRails is an engine for Rails that aims to manage method call status. And you can identify uncalled methods.

This plugin adds functions to support project meetings to OpenProject. Meetings can be scheduled selecting invitees from the same project to take part in the meeting. An agenda can be created and sent to the invitees. After the meeting, attendants can be selected and minutes can be created based on the agenda. Finally, the minutes can be sent to all attendants and invitees.

The peoplefinder provides searchable staff profiles for your organisation. Since it's a rails engine, you can re-skin it for your organisation.

Clearance-based Rails engine for Software as a Service (Saas) that provides account and project management

ScheduleFu allows scheduling events with dates and times. It includes both the model and view portions of a calendar. It borrow heavily from acts_as_calendar (http://github.com/dball/acts_as_calendar) and calendar_helper (http://github.com/topfunky/calendar_helper).

Rails engine supporting multiple auth providers per user.

stripe_invoice adds PDF views and automated emails to your Koudoku-based application

A Rails Engine to fill in a select box based on a country_select

A highly flexible mountable Rails CMS built for rapid application development.

Simple notification system for rails

Allow to track changes of records which done through ActiveAdmin

Converts ActiveAdmin into a simple CMS

ActiveAdmin CMS extension

Plugin for active admin which allows to easy modify I18n translations

Rails 3 Bayesian Ratings Gem