Of course, there is the magic itself: I have some of my own mixed with some conversions - the Battle Mage hdp is one of those. I have a few explanations (and html files) with spell descriptions details zip file.

I also have a few Hackmaster spells, level one arcane: HMA lvl 1 hdp. The html version is here: Hackmaster html

There is a collection of totem abilities, useful for shamans, druids, barbarians, and others who have magical powers gained from totems or animals: Totem Powers hdp. The html file: Totem Powers html

Here's a few more:

Rolemaster Scar Unbinding spells (a few)(hdp) RM Scar Unbinding html
D&D basic spells (used for magic items)(hdp) D&D Spell Prototypes html

The next is my version of the magic that the arcane archer class in D&D might use, if it used this type of magic.

Arcane Archery hdp Arcane Archery html

The next is my version of the magic that bardic music.

Bardic Music hdp Bardic Music html

This is my version of the Dragonsong magic, from Mongoose Publishing's Dragon Magic book. It is still being worked on, as all of these are, but it has a few dragonsongs in it. These spells require knowledge of High Draconic (a language), and most spells require a progression and/or minimum levels of knowledge.

Dragonsong hdp Dragonsong html

Finally, there are some conversions from Fantasy Flight Games Spells & Spellcraft book (just a few, by no means exhaustive):

Abjuration hdp Abjuration html
Evocation hdp Evocation html
Transmutation hdp Transmutation html

Some spells from Magic of Rokugon, in hdp format
The html file of the MOR spells
The html descriptions of the spells

New material May 29, 2005: Magic of Faerun A-C - only 12 spells so far, but it's a start:

Magic of Faerun, in hdp format
The html file of the MOF spells
The html descriptions of the spells