While googling to find some maps to HoMM3, I found this quite interesting mod:
HoMM III: In The Wake of Gods.
It adds very much to the game, and after a bit testing out seems very good mod. It adds numerous things to game from new monsters and skills to graphics and quite interesting features... I really suggest to download it if you have either Complete version of the game or Shadow of Death.
The installing may be a bit tricky, but after that it's extends the life of the game numerous hours, as it includes some nice features to map making as well...
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"As we all know, holy men has born during Christmas...
Like mr. Holopainen over there!"
- Marco Hietala, the bass player of Nightwish