I am trying to decide on the best system for managing banks of test and quiz questions. We are currently using LXRTest v6.1 at our school, but it does not do a good job of exporting to other formats. Importing and exporting of plain text files is not too tricky, but it gets complicated with images...
I also have some question banks in TestGen format as well as some in a very clumsy and misnamed EZ test
I like using the moodle quiz module as well as the HotPotatoes system
I'd be interested to hear what others are using and what they think of their system.