We can recommend these sites:
Open Arts Forum
A publication that features all of the arts: writing, photography, art, video, and more.
Ten Million Flies
“The flies are angry bits of life.” —Charles Bukowski. Ten Million Flies publishes creative work worth buzzing about.
Established in 1984, Clock Radio publishes poetry, fiction, art, photography, interviews, and more. Submissions open.
Horror Sleeze Trash
About as “underground” as you can get on the internet.
Features really fine original writing (mostly poetry and fiction) and book reviews.
Community curated original poetry.