Netbooks are online splatbooks (hence the name; internet splatbooks) created for various /tg/ games. They are typically the product of very devoted fans, but have sometimes also been produced by official game authors who wanted to release content to the fans that, for whatever reason, they could not print and sell.
Dungeons & Dragons has a particularly large array of netbooks out there, if you know where to look. Some notable examples include:
- The Book of Bariaur: An attempt by a Planescape writer to give some much-needed fluff development for the bariaur race.
- The Book of Bariaur Belief: A follow-up to the above that expands upon bariaur religion, clerics and wizards.
- Books of S: The original netbooks released for the Ravenloft setting.
- The Undead Sea Scrolls: A short-lived attempt to publish a yearly netbook collecting fan-made content for Ravenloft.
- Quoth the Raven: The successor to the Undead Sea Scrolls, and still going strong today.
- Van Richten's Guide to the Mists: This was intended to be an official Ravenloft splatbook, but White Wolf lost the rights to publish such content just as it was ready to hit print. Rather than let it be lost forever, its authors released it onto the internet, where it became impossible to lose.