heroes.thelazy.net
Heroes of Might and Reddit
Might & Magic
Heroes 3
HOMM
VCMI
Might & Magic: Heroes 5.5
Jaskinia Behemota
Sok z Crag Hacka
Horn of the Abyss
Heroes 3 memes
Might & Magic (entire franchise)
Heroes 7.5
Feel free to add any HoMM related servers to this list.