Full List of Locations (with links to wiki)
The Mountain Lodge (being converted to a base of operations) in the Greypeak Mountains
Zhentarim (Black Network) - mercenaries ~ verge on adversarial (amoral and viciously competitive)
Anchorites of Talos (secret worshippers of) Cult of Talos (God of Storms & Destruction)
highly active in the North of late (Thundertree, Neverwinter Wood, Triboar Trail, Sword Coast)
Church of Myrkul (God of Death)
attacked Leilon with the Eye of Myrkul present
eye is currently present but cannot be seen because of the Dragon Comet
Cultus Draconis: the old school version - keen on turning dead dragons into undead monsters
Wyrmspeakers (Church of Tiamat): vision of Severin to lure Tiamat into the world
Red Wizards of Thay (Necromancers) - ruled by a Lich King Szass Tam
(See also Campaign Log)
The Netheril Empire (book from Wave Echo Caves and follow-ups)
The Long History of Toril (Note you can click the [^][V] arrows to open sub-eras and events)
Ancient History
The Age of Humanity (and the Netheril Rise and Fall)
Present Age (up to the Spellplague)