xmltvdb creates a database from a set of xmltv listings and then provides a Web interface to view the TV listings in a grid format similar to many Web-based listings providers, but with user customization and no advertising. It supports explicit and bayesian classification of shows to highlight items you like and de-emphasize ones you don't.
SchemaView Plus is a GUI for creating, retrieving, drawing, and printing database schema. It uses Perl, Tk, DBI, and XML packages. Schema can be retrieved using DBIx::SystemCatalog, and it uses XML for storing and retrieving data in text files. You can write any filters to modify these XML files to add new functionality based on your projects (e.g. dropping off some relationships).
Oracletool is an interactive, Web-based application for Oracle Database administration. The advantage of Oracletool over non-Web-based tools is that nothing needs to be installed on the client-side machine or in your databases. All you need to use Oracletool, once installed, is a Web browser.