The Internet Writing Workshop has monitored critique groups for fiction, nonfiction, novels, romance, short prose, poetry, scriptwriting, and practice writing.
Each have participation requirements.
The IWW also has groups discussing the art and craft of writing in general, creative nonfiction, speculative fiction, and marketing.
The IWW is a cooperative. Membership is FREE.
At the IWW blogspot, check especially each Topic in the right-hand panel.