ankane / strong_migrations

Catch unsafe migrations in development

Shopify / maintenance_tasks

A Rails engine for queueing and managing data migrations.

ridgepole / ridgepole

Ridgepole is a tool to manage DB schema. It defines DB schema using Rails DSL, and updates DB schema according to DSL. (like Chef/Puppet)

fatkodima / online_migrations

Catch unsafe PostgreSQL migrations in development and run them easier in production (code helpers for table/column renaming, changing column type, adding columns with default, background migrations, etc).