Expansions
Expansions typically refers to official additions, Armageddon's Blade and Shadow of Death, which both connect to the storyline of the Heroes of Might and Magic III: Restoration of Erathia. Both expansions may be installed independently of each other, and require the original game in order to work. Sometimes Heroes Chronicles is considered to be an expansion, although it is more aimed as an introduction for beginners to the Heroes of Might and Magic -series. The Heroes of Might and Magic III Complete is a collection, that inculded the original Restoration of Erathia game and both expansions Armageddon's Blade and Shadow of Death.
See the links page for other noteworthy Heroes of Might and Magic III projects and resources.