This is not something I typically post in and of itself; rather it would be more appropriate for my month-end Links & Things roundup. However, if I wait until the end of September (considering that I haven't tackled the lengthy August Links & Things as yet!), there would be insufficient time for readers to act. So... this information is courtesy of mediabistro.com's @galleycat email newsletter:
Publisher Harper Voyager, "the global science fiction and fantasy imprint of HarperCollins," will accept unagented -- and complete -- manuscripts for two weeks in October: from October 1 until October 14.
Note that manuscripts are being accepted during this two-week period for "digital publication." Here's more:
The manuscripts will then be read and those most suited to the global Harper Voyager list will be selected jointly by editors in the USA, UK and Australia. Accepted submissions will benefit from the full publishing process: accepted manuscripts will be edited; and the finished titles will receive online marketing and sales support in World English markets. Voyager will be seeking an array of adult and young adult speculative fiction for digital publication, but particularly novels written in the epic fantasy, science fiction, urban fantasy, horror, dystopia and supernatural genres.
The link above provides submission guidelines: please read these carefully and completely. Harper Voyager has even provided an online "submissions portal," which is not yet active, and probably won't be until October 1.
So finish up those manuscripts, and be sure to at least spell check your work! You have a wee bit more than 4 weeks until that cutoff date.
One final note: I have absolutely no connection whatsoever with Harper Voyager -- but should they be in need of an experienced editor, line editor, copy editor....