pkZip - Phil Katz's archive program. pkzip 2.04g was the bees knees for a very long time. That, plus a stack of floppy disks with labels was my version control system for a decade.

Vern Berg(sp?) - LIST.COM - a file viewer, with a hex mode. I ended up writing my own clone, look

TurboPower Software - EDWIN - a wonderful text editor, had the ability to record and run macros.

I used Borland's SkidKick and Turbo Pascal all the time.

I don't remember the name of the image viewing program we all used.