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The Engineer: Also known as the Tinker, Artificer, Gunner, Machinist, Gadgeteer, etc. This is a character class that relies on technology, often of the Steam Punk variety, to achieve ranged controlling effects similar to a wizard. They most likely have guns and bombs as primary weapons, and employ stationary and/or mobile machines on the battlefield. May be seen as "too sci-fi".
One may also argue that The Alchemist (Sometimes known as a Chemist) may count as the above. As opposed to machines and inventions, they use knowledge of poisons, herbs, chemicals, and other such things to fight. Alchemists and Chemists are traditionally crafters, but may often fight too, sometimes using primitive forms of bombs which are, theoretically, possible to create with medieval technology. (Compare throwing a flask of liquid that ignites to modern-day incendiaries.) In addition to lobbing chemicals and bombs, chemists may also craft healing potions, heal everyone with medicines, buff party members with energy drinks, or use them much more effectively. Not as common, as item crafting is often made a secondary skill that can be learned by everyone in some games, partly inspired by Dungeons & Dragons.