MUIbase is described as 'relational, programmable database with graphical user interface for Windows, Mac, Linux and Amiga' and is a Personal Information Manager in the Development category. There are three alternatives to MUIbase for Windows and Mac. The best alternative is EagleData, which is free. Other great apps like MUIbase are es-Builder (Free Personal) and Database Oasis (Paid).
EagleData is a simple but flexible database that I wrote in the last millennium for the good old ATARI. It is useful to file your addresses, catalogue your cd-, games-, or video-collection, etc.. It can even export your data as html-table and print labels.
A software that lets you create custom databases without knowing anything about them. Database Oasis' simple point and click interface allows you to tell it what data you want to store and how you want it presented. The rest is handled for you!