Under the heading of free, if you have 13, the Sample Database for FMS 13 is fairly nice project management DB. Most likely you would have to expand it, but it is a nice start and demonstrates a number of the newer 13 layout funtions. It's very similar to the Projects template in FileMaker 13 with a few additions to handle multiple languages and some other functions as well as a few sample records so you can see how it works.
ALso if you have multiple users and projects have a look at:
Basecamp as well if you're looking at assembla. I know a few FM shops use basecamp for project management.