The Ruby programming language is a powerful tool for building database applications. Ruby has evolved into a de facto standard for interacting with databases, extending the capabilities of the standard libraries to include SQL and NoSQL databases, and adding support for various database backends.
sequel is a flexible and easy-to-use ORM that allows you to define models in a SQL way and use them to access your database. pgsync is a tool that synchronizes data between multiple PostgreSQL databases using COPY FROM SCM command. activegraph is an API client library for ActiveRecord/Base in Ruby on Rails. Full list of the best open source Ruby database libraries are given below