Amun:
Appearance: A man with a ram-head, a ram, or a man wearing a tall ostrich plumed hat.

At the height of Egyptian civilization he was called the 'King of the Gods'. Amun was important throughout the history of ancient Egypt, and when Amun was combined with the sun god Ra, then called Amun-Ra, he was even more powerful and popular.

Aten:
Appearance: A sun disk with rays which end in hands, no real humanoid or animal form.

Aten was a form of the sun god Ra, and during the reign of Akhenaten, the Aten was made the 'king' of the gods, replacing not only Amun or Amun-Ra, but essentially all of the Egyptian pantheon, making this the first recorded instance of monotheism. After Akhenaten the cult of Aten was abolished and the old pantheon of gods restored.

Thoth
Appearance: A man with the head of an ibis holding a writing palette, an ibis, or a baboon, most often crouching.

Thoth was the god of writing and knowledge and the ancient Egyptians believed that Thoth gave them the gift of hieroglyphic writing. He was associated with the scribal profession, which was one of the most prestigious positions in ancient Egypt.

Seth
Appearance: Man with the head of a "Seth animal" which is unidentifiable, though some speculate it may be an anteater or a combination of several animals.

Seth was the god of chaos, the unknown. Seth represented everything that threatened harmony in Egypt. In one sense he was the god of the "badlands" of outer Egypt and the desert regions. He murdered Osiris, sending him to his place on the throne of the underworld, and fought many battles with Horus.

Sekhmet
Appearance: Woman with the head of a lioness, or lioness.

Sekhmet was the goddess of war, violence, catastrophe. Years of great tragedy, like destructive floods, were sometimes referred to as "The Year of the Sekhmet."

Hathor
Appearance: Woman with the ears of a cow, a cow, or a woman with a headdress of horns with a sun disk between.

Hathor was a protective goddess, the patron of revenge and sometimes as the arm of vengeance for the gods. Somewhat ironically (or appropriately), she was also the goddess of fertiity, love and joy.

Horus
Appearance: Man with the head of a hawk, or a hawk

Horus was a god of the sky. He is probably most well-known as the protector of the ruler of Egypt. He had many famous and bizarre battles with Seth, his father. Once he was sexually attacked in his sleep by Seth, but he was quick enough to catch Seth's semen in his hand (the semen of the gods was lethal stuff). His mother Isis quickly cut off his hand and threw it into the Nile to save him, of course replacing his hand with a new one. Later, for revenge, Isis put Horus' semen on Seth's favorite vegetable garden (lettuces) and when Seth picked them he became pregnant with Horus' seed. When the seed of Horus was "called forth" it sprouted out of Seth's forehead like a golden sun, humiliating Seth and proving Horus' dominance.

Anubis
Appearance: Man with a jackal head, or a jackal

Anubis was the god of embalming the dead. Since jackals were often seen in cemeteries, the ancient Egyptians believed that Anubis watched over the dead. Anubis was the god who helped to embalm Osiris after he was killed by Seth. Thus, Anubis was the god who watched over the process of mummifying when they died. Priests often wore a mask of Anubis during mummification ceremonies.

Ra
Appearance: Man with hawk head and headdress with a sun disk

Ra was the sun god and overall the most important god of the ancient Egyptians. At various periods he was conflated or substituted by Amun and/or Aten. The ancient Egyptians believed that Ra was swallowed every night by the sky goddess Nut, and was reborn every morning. The ancient Egyptians also believed that he travelled through the underworld at night. In the underworld, Ra appeared as a man with the head of a ram.

Mut
Appearance: A vulture-headed woman or a woman wearing a vulture for a crown.

Description: The very word Mut means "mother" and at various periods Mut was the great mother goddess of Egypt, even outranking Isis. Often Mut was believed to be a sort of grandmother figure, as Isis was the mother figure for the world. During various periods she was more of an obscure "moon goddess" or goddess of magic, conflated with Isis. The Stela of Paser, which was found near the temple of Mut at Karnak, is a hymn to the goddess, referring to her in the "mother" and "moon" sense who "?has illumined the Two Lands?".

Isis
Appearance: Woman with headdress in the shape of a throne, or a pair of cow horns with a sun disk

Isis was a protective goddess of magic and the moon. At times she was the most popular god in Ancient Egypt. Isis was the wife of Osiris and the mother of Horus.

Osiris
Appearance: A mummified man wearing a white cone-shaped headdress

Osiris was the god of the dead, ruler of the underworld, and the brother/husband of Isis, and the brother of Nepthys and Seth. He was also the father of Horus. As well as being a god of the dead, Osiris was a god of ressurection and fertility. The god Seth (his younger brother) in a jealous rage killed him and tore him into a thousand pieces, scattering them across the land. Osiris' sister-wife Isis used her magic to gather the pieces and with the help of Anubis embalmed her son, sending to rule over the underworld. Isis was also able to resurrect her husband long enough for him to impregnate her, which produced Horus, who then battled Seth constantly.

Some related links on egyptian history and culture, as it relates to The Third Translation.