Well I created this open source system netural adventure for you all.
You will find that it was intended for SAVAGE WORLDS Dead Lands RPG! But you can adapt it to any D20 game as well!
This link has content for Roll20 or usable with any virtual table top game application for your players to enjoy. I did leave a little work for the game master to do though! I know you all like to personalize things with your own touch! This is no different.