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* For PDFs, go to the largest PDF occult library on the internet at Magickal Athenaeum.
A.O. Spare 
Writings and artwork by Spare, writings about Spare.
Bkwyrm.net
Possibly the largest source of independent occult book reviews on the internet, plus a "reader's advisory" to help people find the sort of material they're interested in, as well as links to occult and new age publishers and author websites.
The Book of Thoth - Aleister Crowley
The companion book for the Thoth Tarot deck.
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The LWB for the Thoth Tarot deck - Aleister Crowley & Frieda Harris
The divinatory meanings.
Book T
The Golden Dawn's descriptions and attributions of Tarot cards.
The Collected Works of Aleister Crowley
H. P. Blavatsky
Complete texts of 'The Secret Doctrine', 'Isis Unveiled', 'Studies in Occultism', and more.
Internet Sacred Texts Archive
Primary texts of many different religions and esoteric systems.
The Malleus Maleficarum
'The Witch Hammer' - the guidebook for Inquisitors that helped fuel the Inquisition.
Norton's Imperium
Classics of magick, Frater Achad.
The Old & New Commentaries on Aleister Crowley's Book of the Law
The Pictorial Key to the Tarot - A.E. Waite
The companion book for the Rider-Waite Tarot deck.
Principia Discordia
fnord
The Rosicrucian Archive
Introductory information, key texts, symbolism.
Semiotics for Beginners
The study and analysis of symbols or "signs".
Twilit Grotto Western Esoterica Archives
Tons of classic grimoires.
The Unbound Bible
14 English versions, Greek and Hebrew, 4 "ancient" versions, all searchable.