Online Forums

Nonhuman National Park
Wilder Trails
The Obsidian Spire
Dragons Landing
Draconity
Therian Wilderness
Dragons Valley
Drink Deeply and Dream
Dreamhart

The below websites have shared issues, particularly with their leadership supporting bestiality. For a more detailed breakdown, see here.

The Werelist

Therian Guide

Otherkin Phenomena - OKP does not have any specific controversies that I am aware of, however Otherkin Phenomena is considered a sister-site to Therian Guide.