&

Got an old wild idea resurfaced from that...

An OS "entirely" in Haskell.

... calculator: ghci.

... window manager: xmonad. ... (and... a rewrite of X11 protocol in Haskell, sufficient to run xmonad).

... text editor: yi

... ... and a Haskell shell... would surely be named hash.

I already have irc bots made from the tutorial to make an irc bot in Haskell... that could be converted to an irc client.

... doubtless many more Haskell tools to populate the rest of the purposes.

... Haskell tools to interface with the web could be interesting...