Final Writer 97 (purchased)
TurboCalc (got for free from an Amiga magazine)
TransDOS
Deluxe Paint IV (purchased)
Scala (wanted it but never got it)
DOpus
Bought my A1200 for school work mostly--Bachelor level and later some Masters level. It was small for a small dorm room desk, was the best bang-for-the-buck at the time, was good at multitasking well, was snappy, and did what I needed. Also, it booted fast and no shutdown procedure was needed.
