Auto SharePoint installer
Contains lots of OOTB scripts. Simple XML input file. Create a near-unattended install.
http://autospinstaller.codeplex.com/
Bulk document import
Copy an old-fashioned file share to a SharePoint document library.
http://spbulkdocumentimport.codeplex.com/
Hide the ribbon
Hide all unnecessary menu items, buttons and links for the normal user. Conditions can be set for specific groups.
http://spribbonvisibility.codeplex.com/
Sharepoint and games?
A fully integrated Chess-game.
http://ribbonutils.codeplex.com/
Sharepoint and Social Networking?
Integrate your favorite Social Network sites within SharePoint