ReAnimus Press - Breathing Life Into Great Books

Various tools for writers operated by the ReAnimus Press crew:

In Search of Wonder, by Damon Knight

Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt

General:

Critique.org / Critters - The first writers workshop on the web. (Free.)
General Guidelines & Tips on Avoiding Scams
Fixing smart quotes in Word docs

Staying Alive - A Writer

SF in Dimension, by Alexei and Cory Panshin

Footprints on Sand, by L. Sprague de Camp and Catherine Crook de Camp

Galaxy Magazine: The Dark and the Light Years, by David L. Rosheim

How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush

More Issues at Hand, by James Blish (as William Atheling, Jr.)

Heinlein

The Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert Bloch

The Craft of Writing Science Fiction that Sells, by Ben Bova

Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud Webster

Modern Science Fiction, by Reginald Bretnor, ed.

Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.

Heinlein in Dimension, by Alexei Panshin

Space Travel - A Science Fiction Writer