The Palladium Weapons and armor seriesThe original version of these books were Palladium's first products, during the early 80s (prior to the printing of the 1E Unearthed Arcana, and its "nomenclature of pole-arms" appendix). Most of the non-gun books were, at one time, consolidated into a single perfect-bound book like the CoCW (the top book on the catalogue page), but were in recent years split back into the smaller books with some modifications.
The Palladium Fantasy RPG was published in 1984, by that time only showing its use of a D20 for strike rolls and having a "Palladin" character class to show its roots in a late-70s, VERY-home-rules, variant of what started as a OD&D game in Detroit. One interesting aspect was its inclusion of a skill/action-based experience point gain system, that seemed to be the inspiration for the AD&D 2E optional experience system from the DMG. It also featured a system to choose a second character class and (unlike later Palladium products, or D&D prior to 3E) the ability to switch between classes for advancement. Its set of monsters (And playable races) was far different than its D&D contemporaries, and, again, it took 3E to match it in terms of playability of "non-standard" races. The RPG was updated to the standard Palladium SDC+HP (analogous in many ways to Champions' division of health points) in the 90s, after initially having only hit points. If you really want to throw your 3E players a curve, get one of the versions of the PFRPG's "Monsters and Animals" book, and convert some of the more bizarre creatures into 3.5 stat blocks (just don't put the conversions on the web - Palladium is a bit overprotective of their copyrights). The Zavor would probably drive any D&D party into spastic fits.