Deity Plan

Useful Link

Deities introduced in 4e (easy to get info on)
Avandra

Erathis

Ioun

The Raven Queen

Torog

Zehir

Deities only in another edition or a specific niche publication (easy to get info on)
Aengrist (frostburn)

Bhaal (Forgotten Realms)

Cas (Heroes of Horror)

Chaav (Book of Exalted Deeds)

Karaan (Book of Vile Darkness)

Olidammara (Greyhawk)

The Silver Flame (Eberron)

Talos (Forgotttewn Realms)

The Undying Court (Ebberon)

Ye'Cind (Greyhawk)

Deities that are homebrew (easy to get info on)
Anneliesse

Fellana

Fenrir

Kana

Kyphon

The One who Turns the Wheel

Skeles

Deities introduced long ago, still around (must look at all sources)
Asmodeus

Bahamut

Bane

Corellon Larethian

Ehlonna

Garl Glittergold

Gruumsh

Heironeous

Hextor

Kord

Kyuss (not that old, but has a complicated history)

Lolth

Moradin

Saint Cuthbert

Tharizdun

Tiamat

Vecna

Wee Jas

Yondalla