What is the name of the popular DBMS (database management system) that is open source and is distributed under the General Public License Agreement - GPLA (a license that allows users to make copies of the program and to use the source code to make derivative works)?

Which location-sharing service offers items for users as a gaming component and also allows them to collectively link their check-ins to publish a trip? a. whrrl b. buzzd c. foursquare (this option is wrong i already tried) d. gowalla for plato

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How do i delete my account on this because i didn't read this agreements and also i put age at xd