CommunityEngine is a free, open-source social network platform for Ruby on Rails applications. Drop it into your new or existing application, and you’ll instantly have all the features of a basic community site.

Application deployment software

Calagator is an open source community calendaring platform

Calagator is an open source community calendaring platform

Hyrax is a featureful Samvera front-end based on the latest and greatest Samvera software components.

Hyrax is a featureful Hydra front-end based on the latest and greatest Hydra software components.

Irwi is Ruby on Rails plugin which adds wiki functionality to your application.

iQvoc - a SKOS(-XL) vocabulary management system built on the Semantic Web

Helpesk includes: tickets, ticket types, email-notification, FAQ, subscribers

A data curation Ruby on Rails engine built on Hydra and Sufia

Social Stream is a Ruby on Rails engine providing your application with social networking features and activity streams. This gem packages the basic functionality, along with basic actors (user, group) and activity objects (post and comments)

A Rails Engine that allows an application to CRUD CurationConcern objects (a.k.a. "Works")

MODS Display is a gem to centralize the display logic of MODS metadata.

Simple forum engine.

The PublishMyData Rails Engine. Create rails apps with Linked Data functionality.

A really straightforward open source Ruby on Rails blog engine designed for integration with Refinery CMS.

Taverna Player is a Ruby on Rails plugin to run Taverna Workflows using Taverna Server. Taverna Player surfaces a workflow in three ways: As a Web interface in the browser; As an embeddable widget to be included in any other Web page; As a REST-based Web Service. All three modes provide functionality to fully configure a workflow's inputs; run the workflow on a Taverna Server; collect workflow outputs, logs and messages; and present the results in an appropriate manner.

Markdown Parser for various purposes

#Crowdsourcing management system for #RubyOnRails: http://bit.ly/voluntary-0-7-1

Allow your site's maintainers to easily create forms.