The horse-drawn chariot .
The first use of gas in a war was used in world war one.
machine guns
well, the microwave was invented, the radio, and new guns
Radar, jets, rockets, Atom Bomb, Penicillin
There were lots of new technologies used in World War I. Tanks, airplanes, modern machine guns, poison gas, telephones and radios are a few examples.
Cannons were being used which made it very hard for the opposing army to get in to battle.
Of course (while not entirely new) the proliferation of the machine gun forced the type of warfare that ensued.
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Machine guns, trucks, planes, mortars, and telegrams. These are the first five that come to mind.
Firearm, nuclear, jet engine, radar, radio, etc. technologies saw service in World War 2
Many communication technologies were pioneered during World War I, the most notable of which was radio. Other technologies used then were telegraph and newspapers.
Tanks Poison Gas Germ Warfare