Sweet Portfolio is an image gallery engine with nice frontend capabilities for Rails 3.1 apps (and ComfortableMexicanSofa)

swfu gem for guess

A simple and flexible Rails helper for embedding SWFs in your views.

Easily accept payments from different payment providers such as Stripe, Paypal, Postfinance and SIX.

Theme's for the rails_admin gem

symbolic_enum is an alternative implementation of Rails enum which always returns symbols and works with array as well.

Allow to register unicode symbols and displays them as symbolic icons in rails application. Provides some helpers to generate the links by symbols.

Symmetry gives you a simple way of creating symmetric has_and_belongs_to_many relationships (friends, neighbors, etc.) in your Active Record models. More information can be found at: https://github.com/djonasson/worldwise

Use Synapse to locate and consume services within your platform

Bumper to involve Sync callbacks at external Rails App. Sync turns your Rails partials realtime with automatic updates through Faye

Adds a rake task to easily sync web pages to files. Handy for instance when you want to use a web page as a fixture in your, possibly scraping related, tests and the web page changes often.

Add a model into another model with an external database connection.

Maintain your stored procedures in a single file per procedure, not spread across multiple migrations

Rails generator for SyncMachine.

Open source implentation of a Rails Engine, complete with Devise

System health monitor for Rails applications

System Metrics is a Rails 3 Engine that provides a clean web interface to the performance metrics instrumented with ActiveSupport::Notifications

SystemSettings is a Rails engine that adds settings functionality. Initial setting values can be loaded from file and later edited in a SystemSettings provided admin panel.

Wrapper methods to interface with [TransferTo](https://www.transfer-to.com/home) Airtime API

This gem provides T3 assets for your Rails 4+ application.