Grab It Right Over
Here are over 110 magic items in twenty six pages for any old school style game. A great free resources for details magic items with a great bit of background to add to your campaign. Many of these items have backgrounds that can be adapted for a science fantasy or science fiction campaign.
Using The Adventurer's Ordinance
For Your Old School Campaign
This is a great twenty six page addition to stocking your old school dungeon with items that are not going to derail your adventure campaign.
The author covers most of the major areas including equipment and magic items, along with some background to incorporate these items into your games.
Best of all this twenty four page pdf is free.