active_record_doctor by gregnavis

Add support for master/slave database clusters in ActiveRecord to improve performance. Maintained by bdurand on GitHub, where it has earned 222 stars from the community.

A faster alternative to the custom use of `in_batches` with `pluck`. Maintained by fatkodima on GitHub, where it has earned 156 stars from the community.

Annotate Rails classes with schema and routes info. Maintained by ctran on GitHub, where it has earned 4,491 stars from the community.