Synaptic is a graphical frontend for APT. It features a flexible filter system that allows you to define several criteria for the package list, such as installed packages, not-installed available packages that start with task, etc. It supports both apt 0.5.x and the RPM-enabled apt.
MySQL Administrator is a powerful visual administration console for MySQL, which allows the user to easily administer their MySQL environment, and gain better visibility of how their databases are operating. It is available with native GUI interfaces for Windows, Linux, and Mac OS X.
MySQL Workbench is a cross-platform, graphical database modeling tool for MySQL. It allows you to create database models from scratch as well as by importing existing databases from SQL or DBDesigner4 models. You can then generate SQL code to CREATE databases, ALTER them, and export in various image formats and PDF/PS. Its extension system allows writing plugins and scripts in Lua, Python, and C++.