Germany had superior weaponry and organization on the ground, as well as to some extent in the air. They made a lot of tactical and strategic errors and did not develop and move forward with many of their most advanced weapon systems. They also lost many of their best scientists because of their genocidal anti-Semitism. They diverted enormous resources to the Holocaust. But when you're looking at a land war, the Germans had tremendous commanders and tanks, which allowed an incredibly swift conquest of most of Europe, as well as an incredibly bloody fight against the Soviets, who ultimately defeated them, albeit with lend-lease help from the U.S., as well as, ultimately, the emergence of the Western front.
These are far-out weapons, mostly not deployed.
The Landkreuzer P1500 Monster, a rail gun with an 800mm gun. Never built.
The JU 322 Flying Wing
The Sun Gun, a 3.5 sq mile metallic sodium sun reflector in space
Arodo, Komet, Schwalbe (ME262 jet--300 used in combat), two jets and a rocket-fueled plane
Vampir night vision infrared sights
the Fieseler FI 103r kamikaze bomb plane
FL 282 helicopter
The Vortex Cannon
The X-4 air to air missile
These weapons were key to their actual war efforts:
The 88mm anti-aircraft, anti-tank gun
The MG42 could fire up to 1500 rounds per minute with a 1k range--408,000 were produced
The Panzerkampfwagen III and IV, the main German tanks, and the mighty VI, 54 tons with an 88 mm gun and thick armor (the Leopard was much bigger but got stuck a lot and couldn't fire sideways)
The Messerschmidt BF109, 33,000 produced, two .51 caliber heavy machine guns, used everywhere
The U-Boat, sunk 2,779 allied ships, while losing 765 U-Boats
The Panzerfaust Anti-tank weapon, a short range, simple to operate last ditch tank destroyer, effective at 30y.