Useful information about Open Source Project Management Tools

An article from cio.com about five open source project management apps to watch for
http://www.cio.com.au/article/318425/5_open_source_project_management_apps_watch/

OR Notes

Some useful content on CPM/PERT and related topics.
http://people.brunel.ac.uk/~mastjjb/jeb/or/netpert.html

A PERT Chart software

You can try this
http://www.smartdraw.com/software/pert-chart-software.htm?id=149993