Magick and the Occult
A collection of essays, texts, and lessons on various esoteric and occult subjects.
http://www.armory.com/~mortoj/magick/

Delusions of Grandeur - Gallery of Demons
Descriptions and seals of Demons listed in the Goetia, the Lesser Key of Solomon the King.
http://www.deliriumsrealm.com/delirium/mythology/demon_goetia.asp

Greater Key of Solomon
The book is split into two PDF files.
http://www.boudicca.de/solomon-e.htm

Sword of Moses
An ancient book of magic.
http://www.esotericarchives.com/solomon/sword.htm

The Testament of Solomon
This text is an Old Testament Pseudepigraphic catalog of demons summoned by King Solomon, and how they can be countered by invoking angels and other magical techniques.
http://www.esotericarchives.com/solomon/testamen.htm

The Key of Knowledge (Clavicula Salomonis)
A sixteenth century English translation of the Key of Solomon, the most famous of Grimoires, or handbooks of magic.
http://www.esotericarchives.com/solomon/ad36674.htm

The Key of Solomon (Clavicula Salomonis)
Key of Solomon, the most famous of Grimoires, or handbooks of magic. This edition is translated by Mathers.
http://www.esotericarchives.com/solomon/ksol.htm

Liber Juratus, or the Sworn Book of Honorius
A 13th century Grimoire of the 'Solomonic cycle'. It is one of the foundation works of European magical practice. It was one of Dr. Dee's sources for the Sigillum Dei Aemeth.
http://www.esotericarchives.com/juratus/juratus.htm

Arbatel of Magic
A sixteenth introductory treatise on magic and conjuring angels.
http://www.esotericarchives.com/solomon/arbatel.htm

Goetia
Extensive resource on the 72 spirits from the Goetia.
http://www.geocities.com/xeroiii/Goetia/8Goetia.htm

Esoteric Books
Various classical texts in PDF format available for download.
http://www.liquidrealities.net/downloads.php

Hollyfeld: Grimoire
Grimoires available to download.
http://www.hollyfeld.org/heaven/Text/Magick/Grimoire/