JRuby's ActiveRecord adapter using JDBC.
A modern, simple and very fast Mysql library for Ruby - binding to libmysql
MySQL/Ruby Bindings, wrapped as Gem with improved cross-platform support
An enhanced mysql driver with an async interface and threaded access support
ActiveRecord PostgreSQL Adapter extension for using a cursor to return a large result set
Rails Adapter/Ruby driver for IBM DB2 and IBM Informix
A PostgreSQL client library for Ruby
Ruby bindings for the SQLite3 embedded database
Trilogy is a client library for MySQL-compatible database servers, designed for performance, flexibility, and ease of embedding.