For an author, independent and/or small publishers provide another avenue for publication, with many accepting unsolicited submissions — something that’s virtually unheard of at the major publishing houses. Independent book publishers (also known as independent presses) are not easy to find, but depending on your subject matter, they may be worth the search. Many are open to innovative, experimental, edgy works.
You may want to check these out:
Honest Publishing — Publishes fiction and non-fiction. For unique writers neglected by the mainstream.
Poets & Writers — Listing of several small presses. Includes publishers that accept poetry.