dm-sql-finders add #by_sql to your DataMapper models and provides a clean mechanism for using the names of the properties in your model, instead of the actual fields in the database. Any SQL is supported and actual DataMapper Query objects wrap the SQL, thus delaying its execution until a kicker method materializes the records for the query. \ You can also chain standard DataMapper query methods onto the #by_sql call to refine the query.

Timezone aware datatypes for DataMapper

Collect and visualize Product related data from Bugzilla and Github

Create, Distribute, and Install Ruby applications easily

This Sinatra extension, derived from omniauth_pure by Marcus Proske, adds OmniAuth authorization to your Sinatra application, so your users can login using FaceBook, Twitter and many other authorization providers, as long as you supply the API keys. It uses DataMapper and HAML.

Track stock portfolio from the command line

Simplistic attachment management

Alvid is an advanced AI bot that integrates with slack.

Generates attr_accessors that redact certain values in the JSON structure before saving.

A command line OAuth authorization tool.

Aviary generates a static photo gallery using Twitter

The Browser Exploitation Framework (BeEF) is a security tool that provides practical client side attack vectors.

When mails or messages are sent from your application, Better Opener lets you preview the rendered messages in your browser instead of delivering them.

Simple status display board for Redmine

botolo is a bot engine written in ruby

Command line RSS reader

Github for Mac for Linux. (Highly unofficial)

Run your own server

Clearest: command line tools for REST (Rack/Sinatra) API generation

Strategies for cleaning databases using DataMapper. Can be used to ensure a clean state for testing.