Password manager

keepass - the free and open source password manager

GTD - Task managers

gtd-free - very basic UI and feature set
taskunifier - good UI, support for real-time tracking against tasks with simple consolidation reports
taskcoach - good UI, just for task management.  No support for teal-time time tracking.
rachota - good UI, has support for real-time tracking against tasks with nice graphs
jello5 - integrates with outlook by using hta

MS Project alternatives

ganttproject
openproj
projectlibre