A list of existing Clans and their general ability. These are by no means the only available clans. You can create a new clan on your character without needing to submit it for approval and give it whatever abilities you want so long as they are kept within reason and follow the rules of the site. If you make a godmod clan, then not only are people not going to want to RP with you, but you will be asked to change your clan to be more appropriate, or get rid of it.
Generally, Clans are kept to their village of origin. Because the shinobi villages are separate and mostly isolated, there should not be a lot of members of a particular clan showing up outside the village where that clan is based. Occasionally, one might pop up elsewhere if there's good reason, but please let's try to keep this to a minimum.
You can find a list of canon jutsus for each clan (the canon ones, at least) at the provided links.
Normal Clans
Nara - The Nara clan is known for their intelligence, ninjutsu that entails the manipulation of shadows, and tending of deer such as Rikumaru, which graze in a large area of the Nara clan forest. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Nara_ClanInuzuka - Members are given their own canine partner (ninken) when they reach a certain age. Thereafter, the shinobi and their ninken is practically inseparable. The shinobi and canine allies fight using collaboration jutsu, such as the Piercing Fang or Beast Human Clone techniques that take advantage of their teamwork and their sharp claws and teeth. The clan members are also able to communicate with canines. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Inuzuka_ClanAkamichi - Members of the clan possess great physical strength and are able to quickly convert calories into chakra, which they then use in their various secret techniques. Most of these techniques rapidly consume the user's chakra during use, and maintaining them during a prolonged battle can be tiring. For this reason the Akimichi have high chakra levels and eat a lot in order to build up or replenish their chakra reserves. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Akimichi_ClanYamanaka - The members of this clan specialize in mind-centred techniques which makes them experts at intelligence gathering and espionage. They have also displayed sensory abilities and their techniques include transferring consciousness, reading minds and communicating telepathically. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Yamanaka_ClanAburame - At birth, members of this clan are offered to a special breed of chakra eating insects such as kikaichū as a nest, residing just under their host's skin. These insects will then live in symbiosis with their host from that point on. Because of this, its members are characterized by their use of insects as weapons. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Aburame_ClanHyuuga - All members born into this clan possess the Byakugan, a Bloodline Limit (kekkei genkai) that gives them extended fields of vision and the ability to see through solid objects and even the chakra circulatory system, amongst other things, and expel chakra from any of the chakra points (tenketsu) in their body. Members of the clan are instructed in the use of the Gentle Fist style, which uses the Byakugan to view the opponent's Chakra Pathway System and deal precise blows to disable and impede the flow of chakra. Due to training in this style, Hyūga clan members tend to have excellent chakra control. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Hy%C5%ABga_ClanKaguya - Members of this clan possess a Kekkei Genkai that allows them to grow and expel their bones from their bodies to utilize as weapons and for defensive purposes. This clan is based in Kiri.
http://naruto.wikia.com/wiki/ShikotsumyakuHōzuki - The members of this clan possess the ability to turn their bodies into liquid form using the Hydrification Technique. This ability however seems to require that they stay hydrated at all times and as such at least two known members are known to carry water bottles around with them. This clan is based in Kiri.
http://naruto.wikia.com/wiki/H%C5%8Dzuki_ClanHanyou - Members of this clan are viewed as demons. They require blood to survive, as opposed to regular food, can manipulate their blood into various jutsus during combat, and can transform into demonic-looking, bestial forms. This clan's origins are unknown and is not based anywhere specifically.
Mitsukai - Members of this clan are viewed as angels. Their chakra takes on a unique color, determined at birth, they can transform into angelic-looking forms, and possess many light based powers (utilizing actual manipulation of light, not to be confused with the Storm Release, which manipulates beams of energy). This clan's origins are unknown and is not based anywhere specifically.
Nekomimi - Similar to the Inuzuka Clan, members of this clan share traits with felines, including cat ears and tails. They also have increased flexibility, balance, agility, and senses. Unlike the Inuzuka Clan, however, they lack an animal partner. This clan is based in Iwa.
Elemental Release Bloodlines
Senju - Members possess the Mokuton, or Wood Release kekkei genkai, which combines the elements of earth and water. This clan is based in Konoha.
http://naruto.wikia.com/wiki/Wood_ReleaseSatetsu - Members possess the Jiton, or Magnet Release kekkei genkai, which combines the elements of lightning and earth. This allows the manipulation of metal objects, most commonly through the use of iron sand. This clan is based in Suna.
http://naruto.wikia.com/wiki/Magnet_ReleaseShoton [official name unknown] - Members possess the Shoton, or Crystal Release kekkei genkai, which combines the elements of wind and earth. This allows the creation manipulation of various crystalline structures. This clan is based in Suna.
http://naruto.wikia.com/wiki/Crystal_ReleaseYuki - Members possess the Hyouton, or Ice Release kekkei genkai, which combines the elements of wind and water. This clan is based in Kiri.
http://naruto.wikia.com/wiki/Ice_ReleaseKashou - Members possess the Yoton, or Lava Release kekkei genkai, which combines the elements of earth and fire. This clan is based in Kumo.
http://naruto.wikia.com/wiki/Lava_ReleaseRanton [official name unknown] - Members possess the Ranton, or Storm Release kekkei genkai, which combines the elements of water and lightning. This allows for the creation of energy beams that can be guided towards the enemy. This clan is based in Kumo.
http://naruto.wikia.com/wiki/Storm_ReleaseFutton [official name unknown] - Members possess the Futton, or Boil Release kekkei genkai, which combines the elements of water and fire. This allows for the creation of corrosive mists that can burn and corrode objects. This clan is based in Iwa.
http://naruto.wikia.com/wiki/Boil_Release