All of those guys are not like the others!

Only two of those people are even on the same order of magnitude of influence.

I'd say three, although the work of the third one (which I'd assert is Theo) is more obscure it's pretty darn critical and influential[0]. Unless the two you were thinking of are Linus and Theo?

[0] http://en.wikipedia.org/wiki/OpenSSH

Oh true that, I'd forgotten all about how SSH wasn't originally Free.

Assuming you're talking about Gruber: note that he is a programmer and invented Markdown:

http://daringfireball.net/projects/markdown/

Not that that puts him on the same level as the others, but it is true (as the GP suggested) that his name is well-known here.