RDQS (Ruby Data Query Shell) is a text-based shell for querying SQL databases. It features connection bookmarks, shortcuts, history, completion, paging, shell interaction (via backtick operator), CSV/INI/XML/Table output, output redirection, numerous configuration options, multiconnect with fast switching, and a watch command (execute given query/shortcut in a fixed interval).
The Ruby on Rails SubList Plugin makes it easy to have dynamic lists of related models on a single editing page. The plugin is designed for models with one or more has_many relationship with other models. By using AJAX for adding and removing "sub-forms", one can present the user with a single edit page that creates/edits the parent model as well as all of the children.
4Sports is an exercise management application. You can use it to analyze your exercises in a number of ways. 4Sports can import data from the Garmin "Forerunner 201/301" devices, and can display some information in a table and in a graph (like heart rate over distance). It's also possible to export the tracks (GPS data) into Google Earth, where the track is color-coded according to your heart-rate. The graphs can be exported to SVG files.
manqod is a tool for handling any data for which you can write queries. You can design manqod to be a frontend for users to view data in lists and modify data in lists or forms. You can write events to do more than just data management. The whole frontend is built dynamically, and you design it.