Various tools for writers operated by the ReAnimus Press crew:

Galaxy Magazine: The Dark and the Light Years, by David L. Rosheim
Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.

General:

Space Travel - A Science Fiction Writer
The Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert Bloch
In Search of Wonder, by Damon KnightHeinlein in Dimension, by Alexei PanshinModern Science Fiction, by Reginald Bretnor, ed.Footprints on Sand, by L. Sprague de Camp and Catherine Crook de CampMore Issues at Hand, by James Blish (as William Atheling, Jr.)The Craft of Writing Science Fiction that Sells, by Ben BovaAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushThe Issue at Hand, by James Blish (as William Atheling, Jr.)Staying Alive - A WriterHeinlein