REMO == Remo Edits Makello Online: you can -- either with a web browser or a face-to-face Ruby application -- define SQL tables, links & indexes. REMO turns this into the framework of an application to manage the data (first sales data, so Makello).
RailsDB is a web application written in Ruby using the Ruby on Rails web framework to provide a generic interface to popular open source databases such as MySQL, PostgreSQL, and SQLite.