Saturday Mac riddles 225

Here are this weekend’s riddles to entertain you through family time, shopping and recreation.

1: Stacks inspired by Bill’s trip went wild in 1987, but died before Mac OS X.

2: Climber’s extender for 2D graphics before quartz.

3: This Scottish colourist was his killer app of 1984.

To help you cross-check your solutions, there’s a common factor between them.

I’ll post my solutions first thing on Monday morning.

Please don’t post your solutions as comments here: it spoils it for others.