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Is to create all kind of diagrams: UML, company relation, flow charts, network diagrams, electric diagrams and much more.

KeePass: Is an excellent password manager to store all your passwords and check on them any time you like.
System Scheduler: Is an excellent tool to program the execution of tasks, batch files, scripts and many things more.
GMail Drive: Creates a virtual system of files using the GMail account from Google, allowing GMail to be used as a storage media.
Stellarium: Is a no cost program that shows a three dimensions sky, similar to the real, as if you were observing with a telescope.
Mozilla Sunbird: Is a totally gratuitous calendar and activities organizer developed by Mozilla organization.