Partisan is a Ruby library that allows ActiveRecord records to be follower and followable, just like on popular social networks. It’s heavily inspired by acts_as_follower which is no longer maintained.

Object creation methods everyone already has

Serialize objects into Protocol Buffers messages

Peek into your ActiveRecord stats.

Multi-tenancy framework. Out of the box, supports Postgres schemas and per-tenant databases

Performify helps you to define your app logic in separated and isolated service classes that is easy to use, test and maitain.

Creates a Histogram fron an ActiveRecord query

This gem provides a class with methods which map directly to the SQL stored procedure APIs provided by pglogical. It also provides a way to mix these methods directly into the ActiveRecord connection object.

Queues system for AR/Rails based on PgQ Skytools for PostgreSQL, like Resque on Redis. Rails 2.3 and 3 compatible.

Console utility for gracefully rebuild indexes/pkeys for PostgreSQL, with minimal locking in semi-auto mode.

Read a dynamic database.yml file and allow you to drop/create the database on demand.

Sends messages to kafka using different formats and strategies

Pipeline is a Rails plugin/gem to run asynchronous processes in a configurable pipeline.

Polo travels through your database and creates sample snapshots so you can work with real world data in development.

Choose per model and/or controller&action whether a read-only query should be sent to master or a hot standby. Or just use Postamt.on(:slave) { ... }.

Adds helpers to migrations and dumps check constraints to schema.rb

Uses Postgres's powerful COPY command to upsert large sets of data into ActiveRecord tables

Adds support for CTEs for PostgreSQL and ActiveRecord

Thin ActiveRecord Redshift Adapter extension for existing PostgreSQL adapter.

Ruby/Rails DSL for Prediction.io, an open source machine learning server.