activerecord-originator by pocke

This gem automatically logs SQL EXPLAIN of every queries. Maintained by yhirano55 on GitHub, where it has earned 49 stars from the community.

URL-friendly, base32-encoded UUIDs for Rails models. Maintained by pch on GitHub, where it has earned 85 stars from the community.

Transparently combine many reporting queries (on the same tables) into one fast query—even when queries have different groups or scopes. Maintained by midnightmonster on GitHub, where it has earned 131 stars from the community.