Gomu Gomu no Mi

Meaning: "Gomu" is the Japanese word for "rubber". It can also be used as "gum".
English name: Gum Gum Fruit
Effect: Permanently turns the body into extremely durable natural rubber, allowing the user to stretch his or her body like rubber and to have a cushioning effect on all blunt forces impacting his body. Sharp edges can still pierce or slash through this cushioning effect with relative ease. Due to the user's body turning into rubber, the naturally high resistance makes the user immune to electrical attacks.

Hana Hana no Mi

Meaning: "Hana" is, in this context, the Japanese word for "bloom"
English name: Hana Hana Fruit. Referred to by its original Japanese name in the English dub.
Effect: Allows the user to replicate and sprout pieces of his or her body multiple times from the surface of any object or living thing. However, they can't be formed in areas where there is not enough space, such as inside someone else's body. It has been shown that the user feels any pain directed onto the extra limbs. So long as the target is in sight of the user they can respond to them.
user: Robin

Hito Hito no Mi

Meaning: "Hito" means "person".
English name: Human Human Fruit
Effect: Allows the user to turn into a human, and gives an animal consumer human intelligence. It has been stated that a human user simply would become "enlightened." ^[2], and unable to swim....
Consumed by: Tony Tony Chopper.

Mera Mera no Mi

Meaning: "Meramera" is the noise a fire makes when it burns.
English name: Flare Flare Fruit
Effect: Allows the user to transform into fire at will as well as control it. It is equal in strength to the powers of Moku Moku no Mi.
Consumed by: Portgas D. Ace

Yomi Yomi no Mi (ヨミヨミの実)

Meaning: "Yomi" is short for "Yomigaeru" which means "revive" or "reborn."
English name: N/A
Effect: Initially, nothing. When the user dies, however, it brings them back to life once. Upon death the spirit is halted from traveling to the realms of the dead and is instead allowed to locate its body and be revived. However, this does not prevent the users body from decaying, hence Brook's skeleton appearance.
Consumed by: Brook

Moku Moku no Mi (モクモクの実)

Meaning: "Mokumoku" means silent, and "moku" is an anagram of "kumo", which means "cloud", "moku" is also the sound billowing smoke makes.
English name: Smoke Smoke Fruit (English anime), Plume Plume Fruit (English manga)
Effect: Allows the user to transform into smoke at will as well as control it. In the English dub, the user is also able to breathe it (this is only due to the removal of Smoker's cigars, which resulted in him looking like the smoke was coming directly from him).

Suna Suna no Mi

Meaning: "Suna" means "sand."
English name: Sand Sand Fruit
Effect: Allows the user to transform into sand at will as well as control it. Its power could be honed to the point where the user could also dry anything the user grasps, killing the living through dehydration, and causing all other matter to crumble to dust. However, Crocodile turns solid when in contact with liquids, including blood (or sweat in the English dub) due to the sand sticking together.
Consumed by: Sir Crocodile.

Bara Bara no Mi

Meaning: "Bara" refers to the sound a knife or other sharp object makes when it hits a cutting board, while "Barabara" means to disconnect.
English name: Chop Chop Fruit
Effect: Allows the user to split his or her body apart and control the pieces at will, also becoming permanently immune to being cut. However, in order to split apart one of the bodys parts must remain grounded, that is act as normal (e.g. Buggy's feet walking on the ground while the other body parts were sent flying towards a target).
Consumed by: Buggy the Clown.

Hie Hie no Mi

Meaning: "Hiehie" means "chilly."
Effect: Allows the user to transform into ice as well as control it. The user can also lower the temperature of a body if keeps contact to it. The user is also unable to get hypothermia or any cold related diseases.
Consumed by: Aokiji.

Mane Mane no Mi (マネマネの実)

Meaning: "Mane" means "imitation" or "mimicry."
English name: Clone Clone Fruit
Effect: Allows the user to turn into anyone he or she has touched. When the user changes, he also imitates the copied persons flexibility, strength, etc. ^[1] and can switch back to his normal state by touching his face with his left hand. The user cannot mimic any Devil Fruit powers the copied person possesses.
Consumed by: Mr. 2 Bon Clay.