DbValidator helps identify invalid records in your Rails application that don't meet model validation requirements. It finds records that became invalid after validation rule changes, and validates imported or manually edited data. You can use it to audit records before deploying new validations ...

DB Watcher helps developers debug Rails applications by tracking all database changes

Tool for better visualizing and managing dependencies

A small library to count things. Use Redis, Memory, or bring your own storage!

Administrative UI for GeoBlacklight. Built on Kithe.

Often use snippet for ActiveRecord.

Permit to avoid N+1 queries problem when using graphql queries

Internal Affairs integration helper

Manage application level keypairs with automatic rotation and JWT support

LedgerAccountable is a gem for recording ledger entries to store an accounting history in your Rails models.

システムが稼働する上で最初から必要なデータ（マスタデータ）を管理するツールです。

Perilune is a Rails Engine that allows you to define Task classes for procesing files and handles their processing on the background for you.

PlainQuery helps in decomposing your fat ActiveRecord models and keeping your code slim and readable by extracting complex SQL queries or scopes into the separated classes that are easy to write, read and use.

Some basics used for setting up rails projects

A Ruby gem that helps create test data by analyzing and extracting real records and their associations from your database.

This gem provides recommendations by calculating similarity scores using the Jaccard Index, Dice-Sørensen Coefficient, and collaborative filtering.

Flexible quota system for resources.

Use roar representers with respond_with in a way that you can easily use multiple representers for the same model and for the same controller but without being mandatory. Support ActiveRecord, Mongoid, and any Ruby object that responds to `to_model` and `model_name`.

A dsl for filtering data in web requests

RSpec matchers to check when ActiveRecord objects are created/updated/destroyed