It can be useful when you you are developing some app where you will work with meetings, events etc.

A forward-chaining rule engine in pure Ruby.

Yandex ClickHouse database interface for Ruby

A Danger plugin for Android Lint

Easy SQL based report generation with the ability to accept request parameters and render multiple formats.

Deprecated: see https://github.com/se3000/ruby-eth instead

This gem allows you to easily dump and transform subset of your ActiveRecord models and their relations.

This gem allows you to easily dump and transform subset of your ActiveRecord models and their relations.

Convert xcodebuild plist files to JUnit reports

fluent Slack plugin

A resource-centric approach to implementing the controllers, routes, and serializers needed to support the JSON API spec.

Only syncs files that have been updated to S3.

A simple framework for building APIs with Grape

Use of web components and polymer-project in Ruby on Rails projects

Prawn Handler for Rails. Handles and registers pdf formats.

Reckon automagically converts CSV files for use with the command-line accounting tool Ledger. It also helps you to select the correct accounts associated with the CSV data using Bayesian machine learning.

Resource Kit provides tools to aid in making API Clients. Such as URL resolving, Request / Response layer, and more.

The Ruby Language Toolkit provides classes for creating context-free grammars, lexers, parsers, and abstract syntax trees.

A small gem consisting of helpers for using Sorbet & RSpec together.

RTanque is a game for programmers. Players program the brain of a tank and then send their tank+brain into battle with other tanks. All tanks are otherwise equal. Rules of the game are simple: Last bot standing wins. Gameplay is also pretty simple. Each tank has a base, turret and radar, each of which rotate independently. The base moves the tank, the turret has a gun mounted to it which can fire at other tanks, and the radar detects other tanks in its field of vision. Have fun competing against friends' tanks or the sample ones included. Maybe you'll start a small league at your local Ruby meetup.