An upcoming Jet A1 engine worthy of mention; Deltahawk.
http://www.deltahawkengines.com/
Comes in 160-180-200 HP, dual charged, two-stroke, nothing electrical (apart from alt and starter), no valves, no cam, no pushrods.
And after many years, finally not vaporware either as the first batch is being shipped.
They've got some impressive fuel/performance numbers posted on the site, but I'm looking forward to what the first customer says.
Disadvantages include weight (around 400 lb installed, including peripherals), the need for fuel return + ventilation, purchase price.
edit: And no, it's obviously not certified yet.