Simon Tatham also wrote PuTTY, which was for the longest time the best SSH client on Windows (I don't use Windows anymore so I can't say if it still is or not).

Simon Tatham also wrote PuTTY, which was for the longest time the best SSH client on Windows (I don't use Windows anymore so I can't say if it still is or not). I can't find the quote now, but I remember him saying that between PuTTY and his puzzle collection, his contribution to human productivity was net zero