gBootRoot makes the construction and development of distributions fun and simple with its Root Methods (Yard) and user-mode-linux test bed. Finish the product with a Boot Method (2-disk compression supported). Normal (non-root) users can make root filesystems and boot disks. It includes the make_debian script to create a testable user-mode-linux base Debian system, add-ons to enhance methods, and an MTD Emulator useful for running distributions made with the jffs/jffs2 filesystem.
gscanbus is a little tool for testing and visualising the firewire IEEE-1394 bus. Using the Linux ieee1394 subsystem, it displays a graphical tree of all connected firewire devices and allows basic control of camcorders and other devices. It is designed as development and debugging tool and can be used for testing the basic firewire setup of a Linux machine.
Zaval Database Front-end is a light and functional Web-based front-end to any database for which you have JDBC drivers. It allows raw SQL code execution and is limited only by the extent of the database's SQL support. It supports multiple query execution, alternate languages, and more.
Ftwalk is a high level script programming language, very similar to awk, but greatly extended to include a richer type system, object-oriented features, 300+ built-in functions, extensibility through dynamic libraries, etc., which makes it roughly comparable to languages like Perl. It does file tree searches, and was originally used to implement selective redundant copy backup stores. It can be run interactively as a calculator.
Defaults Manager is an editor for the User Defaults preferences database on Mac OS X. It allows you to easily view, edit, delete, and backup preferences, and can be used to view and change the preferences in almost any application. It is useful for developers that want to make sure their preferences are being stored and changed correctly, and can be used to unlock features that previously required the use of Terminal.