EXOS is a J2ME library for mobile devices to securely exchange data over the Internet with multiple groups of people, who are permitted to read different parts of the data only. EXOS takes care of authentication and key exchange (involves a server).
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This is a project to maintain maps updated on a server of HalfLife, currently map developers stores their maps on a web page or on ftp, now the developers have a repository common to all and server admins have a program to update the maps.