pg_trunk by nepalez

Textacular exposes full text search capabilities from PostgreSQL, and allows you to declare full text indexes. Textacular will extend ActiveRecord with named_scope methods making searching easy and fun!. Maintained by textacular on GitHub, where it has earned 955 stars from the community.

Make use of recursive queries in Rails when using Postgresql or SQLite. Maintained by 1and1 on GitHub, where it has earned 83 stars from the community.

Active Record extension providing slotted counters support. Maintained by evilmartians on GitHub, where it has earned 116 stars from the community.