Advanced Player’s Guide published by Expeditious Retreat Press for Dungeons & Dragons 4E.
Credits: The entirety of the book, save for the Craft’s system and a few tweaks by Owen K. C. Stephens.
Notes: An enormous undertaking, intended to bring a lot of past-edition options into 4E. This includes variants on old races and classes, designed to work with WotC’s upcoming plans (so far as I know them), rather than against them. A tough project, but one I’m immensely proud of.
The Freeport Companion, published by Expeditious Retreat Press for Dungeons & Dragons 4E.
Credits: I actually only sort of worked on this book, in as much as they used/adapted some of my material from the Advanced Player’s Guide. But I’m a huge fan of the Freeport setting, and my name’s in it, so I’m happy to add it to my list.
Notes: This book includes the 4E-compatible mechanics and material to support Green Ronin’s system-free Pirate’s Guide to Freeport.