'If Monks Had Macs' was a wonderful mixed bag of surprises.
People here mention Excel or FileMaker as simple programming environs, but I am hard pressed to think of any popular game written in either of them.
Hypercard could implement many simple office workflow solutions and was a fun toy, too.
Industrial strength solutions are written by teams to solve big problems, but tools like Hypercard offered personal computing one's own personal solutions. Personally useful stacks could be created in a few minutes to implement games, databases, workflows, or most anything you could think of.