On Sat, 21 Sep 2013 15:16:44 -0700 (PDT), Offramp
wrote:

Nothing yet. Microsoft will release three at the same time.

There is. There's 'Buses Due' (free), 'London Bus Hub' (free) and
'London Bus Checker' (£1.99).

I tried Buses Due but I am annoyed with them for trying to con me with
a prize draw that would have cost me £4.50 had I not checked the T&C.