HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

the community is divided into pens; if you play Jebus Cross, go to HotA; if you play single-player (where 95% of all maps are) — go to SoD.

Highly debatable statement. I play both single-player and multiplayer in HotA with equal success. Of the plugins, I only used HW-rules 1.4, but with the latest update, even that became unnecessary. In SoD I use Pack_Ukr (because the Cyrillic localization of Platinum leaves much to be desired — both the translation and its graphical component), the armor fix (unnecessary in HotA), and the same HW. I wouldn't mind getting acquainted with others as well.