Kathy Schrock's Guide to Everything website offers some great resources when creating a PBL unit. She provides several resources that are all organized and linked. I found her assessment resources to be very helpful.
http://www.schrockguide.net/authentic-learning.html

This website offers several different online interactive concept maps that I have found to be very helpful in the development of my PBL unit.
www.readwritethink.org

This is a web tool that can turn videos into an interactive assignment.
http://www.edpuzzle.com/

The Teaching Channel offers several videos on incorporating Project Based Learning projects as well as teaching practices.
https://www.teachingchannel.org/videos?q=ProjectBasedLearning