Of course, there are some awesome tools out there to help you as a GM. This is an unordered collection, vote for your favourite ones in the replies below:
the infamous yxans klagan:
smoke raven has some really powerful tools collected, I'm especially amazed about this one:
For the ultimate number-nerds:
other Random generators:
Onepage dungeon generator:
post your questions concerning rules or lore here. If in doubt, use ::: spoiler Spoilertags like this one :::
@theLazyPragmatic
@lemm.ee