I've been using FddTools for a project. I really like the simplicity of the tool (since I'm using FDD on a relatively small project). But there doesn't seem to be much activity at fddtools.sourceforge.net
I just looked at FDD Project Management Application and it seems to be a great tool, though a little heavyweight for what I'm doing now.
What is everyone else using? Are the "pure" FDD tools worth supporting? Or are spreadsheets and conventional PM tools sufficient?