A while back I stumbled on Algebrakit-toets. I never got round to archiving and/or describing it, so here gooes. Algebrakit-toets provides an semi-automatic environment for creating tests and answer-sheets. It can be started here (Dutch, programmer Martijn Slob).
In a wizard-like environment it can:
Step 1: general information: first input general information on the test
Step 2: choose the level, subject and number of tasks. Note that changing the order of questions seems a bit hard to do.
Step 3: now indicate how many different tests you need
Step 4: clicking “Genereer toetsen” makes the appropriate tests. Clicking “Bereken de antwoorden” generates the answers. This can take a while. Clicking the button shows intermediate steps. You can also choose just to continue.
Step 5: here, finally you can download the task and answer sheets. Nte: for the latter to work you will have to “Bereken de antwoorden”.