Horizons: Empires of Istaria:Official site, with game information, news, and message board.
Horizons Vault: Member of the Vault Network. Has news, interviews, polls, screenshots, and message boards.
Horizons Warcry: Presents news, interviews, information and forums.
Port of Horizons: Game news and information, including a world map, bestiary, forums, guilds, guides, and multimedia.
RPG Expert: Tips and guides.