Basecamp is a great online collaborative web service that's been available for a while. Now there is an open source (and free) alternative to Basecamp called ActiveCollab. Read More...

I just got notified that SharedPlan project management software has released a free version called OpenPlanning Edition. Think Microsoft Project meets flowcharts. Good stuff and you can't beat the price. You should check it out if you have the need to get better at managing your projects.

If you are a student you should check this out:

https://eduregistration.graphisoft.com/default.aspx

Click here for the SolidWorks eDrawings Viewer. We've been using this in my office for about 6 months. It is cross-platform and opens the latest version DWG files.