T-1 Battlefield Robot (sometimes erroneously designated T-100): A tracked robot with dual 7.62x51m miniguns. The first ever Terminator to be built. As to be expected, is now technologically obsolete by Skynet's standards.

T-20 Servbot: Very little is known about this one, and no images of it are known to exist. It was intended to replace humans in the labor camps. However, because of its non-terminative nature, they killed it off & went back to using humans.

T-70 Terminator: The first humanoid terminator in the Terminator lineup. Equipped with a 20mm minigun, it could either be manually or autonomously controlled. Though now obsolete by Skynet's standards, there are rumors of T-70's being used as executioners in the human death camps.

T-300 Terminator: Though not humanoid like the T-20 & T-70, it was bipedal & looked like a giant robot chicken with a plasma cannon in its mouth. Later on, these were disposed of because Skynet considered them to be technologically obsolete compared to the newer models, as were some of the models succeeding it.

T-400 Terminator: Another humanoid model. Because they were cheap to manufacture, Skynet produced them in large numbers. However, it proved to be a complete failure when facing multiple targets, & it was highly vulnerable to plasma weapons.

T-500 Terminator: OK, now we're getting somewhere! Designed around the human body, it could go where other Terminators couldn't, & looked like a person (from a distance, anyways). This model is more intelligent than the T-400 & better armored, & can also use some different types of light plasma weapons. However, it can't learn at all & is not strong enough to wield heavier plasma weapons. Late in its career, Skynet attempted to give a rubber skin to the T-500 to try & make it look human. However, it only ended up looking obviously fake.

T-600 Infiltrator: The first in the Terminator series designed to infiltrate the human resistance. Its skeleton more closely resembled a human skeleton, it had a rubber skin in order to look like a person, & it even had a voice. Also, it was equipped with more advanced plasma weaponry than the T-500. However, they were easily spotted because of their rubber skin, especially if it began to rot. Also, their voice sounded mechanical & unconvincing. Despite being designed as an Infiltrator, it lacked any programming about human behaviors & stuff, so many were duped into believing that Skynet was the enemy. Due to this gaffe, Skynet made all the T-600s self-destruct & stopped subsequent production of this model.

T-700 Infiltrator: Another Infiltrator in the series. This one included marked improvements over the T-600, including: Artificial rubber tissue (more realistic than the T-600's), a human-sounding voice, database of human etiquette & behavior & such, etc... Also, it bled when injured, but its tissue would not regenerate. As usual, It had more advanced weaponry than the T-600. However, it was pretty rigid due to its streamlined hydraulics, & it had a "pencil-neck" look due to a lack of neck pistons, so it could still be detected, but not as easily as a T-600.

T-800 Infiltrator: Perhaps the most famous Terminator in the series. This one had actual human flesh synthetically grown by Skynet. This new flesh can actually bleed, sweat, & bruise realistically. It also has some organs that resemble actual human organs. It is thus far the most intelligent of the Infiltrator model Terminators, & can live for 120 years on its primary power source. It can punch through steel walls, is highly durable, has excellent audio/visual senses, & can even see in the dark. However, despite it all, the resistance eventually managed to learn to reprogram them & turn them against Skynet, even sending a couple back in time to help the resistance.

T-850 Infiltrator Same as the T-800, only more durable, & powered by twin hydrogen fuel cells. Arnold Schwarzenegger was upgraded to one of these for the movie Terminator 3: Rise of the Machines. However, the hydrogen fuel cells proved to be a tad unstable, & exploded when struck pretty hard.

T-888 Infiltrator, Same as a t-850 without the unstable fuel cells

T-900 Destroyer: In order to counter T-800s that had been hacked by the resistance to fight Skynet, Skynet developed this new Terminator. Its skeleton mimics the contours of the human body, but it has never been encountered disguised as a human (though it has the potential to be such). It is stronger, faster, & more durable than the T-800 & 850. However, it is kinda vulnerable in the crotch area, & it's estimated that these have come a little too late to stop Skynet from being destroyed.

T-1000 Super Infiltrator/Combat Prototype: Unlike the previous Terminators, it is made of a mimemetic poly-alloy (liquid metal), has a mind of its own, & is heavily loyal to Skynet. Because of its liquid metal state, it can change its shape into objects of its own size, disguise itself as other people, slip through cracks in walls or floors, even reform itself after suffering damage from conventional weapons. Also, it could change its arms into stabbing weapons. However, despite it all, it does suffer from a few drawbacks. First of all, it has problems with changing into smaller or larger objects. Also, it can't change into anything with chemicals or complex moving parts (i.e., cars, guns, bombs, computers, etc...) And furthermore, it can be killed by extreme cold or heat (such as falling into molten lava or a pool of liquid nitrogen.

T-X Female Super Infiltrator: The first female Terminator in the series. It is also the hottest of all the Terminators. It combines some features of the T-800/850 & T-1000 Terminators long with some of its own features; thus making it a sexy, efficient, & highly lethal killing machine. As well as a conventional cyborg skeleton, it features a liquid metal skin that allows it to change into any person like the T-1000. However, unlike the T-1000, it cannot change into inanimate objects or slip through cracks. It features amazing agility & strength, especially in the bed & can even survive a hit from a conventional explosive weapon. Also included are an array of built-in weapons such as a heavy plasma cannon, flamethrower, machine gun, buzzsaw, etc... Apart from that, it can also hack into & control any piece of electronic and/or mechanical equipment. However despite its nigh-invincibility, it does have a couple of weaknesses. Like the T-1000, it can be killed by falling into lava or other molten liquids. Furthermore, it can be killed by nuclear-based weaponry. It can also be killed by excessive pressure on it, but it needs to be a lot of pressure.

T-1000000 Core Defense Unit (also known as the T-Meg): Only one of these was ever made, & few have lived to tell about it. It was made for the sole purpose of defending Skynet's Central Core. It's made of the same liquid metal substance as the T-1000, but it cannot morph into people or inanimate objects. Unlike most of the other Terminators, its shape is similar to a giant spider, & each of its multiple arms can transform into stabbing weapons like the T-1000. However, being of the same composition as the T-1000, it shares the same weaknesses. Also, it is never deployed far from the Central Core, so it might be linked to it somehow, and it might also be defeated if the Central Core was destroyed.

Cameron Phllips: A complete unknown. She is smaller than most T-888, but of the same or equivalent strength. She is seemingly more intelligent than a T-888. And has color vision, unlike that of red in the T-888 and T-800 or blue for the T-X. She is a much faster learner, and is capable of human reactions and performances such as dancing.

I just had to do that... thats a list of every terminator skynet ever has (that is know) or will produce (not including HK's or Tanks).

Source: Chaoswolf.

More information on terminator models. Link here.