"HTSQL is a URI-based high-level query language for relational databases. HTSQL wraps your database with a web service layer, translating HTTP requests into SQL and returning results as HTML, JSON, etc.

HTSQL is designed for someone who is not a SQL expert, but needs a usable, comprehensive query tool for data access and reporting."

"Moneta provides a standard interface for interacting with various kinds of key/value stores."

"Reflection is designed to keep your development system in sync with your production system’s files and database (by dumping). It uses a shared git repository to store these files, which allows you to mirror your production environment without the need of direct access to your production servers."

Rake task to help you find places where you probably need db indexes in your rails app, and to generate a migration to easily add those indexes.

Seems like a great way to migrate legacy data from an old db into a new rails app's db. From the talk: http://github.com/mokolabs/legacy/tree/master

"Cassandra is a hybrid non-relational database in the same class as Google's BigTable. It is more featureful than a key/value store like Dynomite, but supports fewer query types than a document store like MongoDB."

rails plugin to dump db data yo yaml

"This rails plugin not only runs "EXPLAIN" before each of your select queries in development, but provides a small DIV in the rendered output of each page with the summary of query warnings that it analyzed."

helpful