apt-got builds and supervises a partial (or full) Debian mirror, that is filled on-the-fly by apt-get requests. But there's more! Its modular mirror engine is ready for customized mirroring algos. So you can easily make your own module! (Eg for apt4rpm)
NEW System with NEW FILE SYSTEM IN DATA BASE (Firebird), with service for ftp access and more.. You can access with web browser, Java VM applications, Object Pascal, C++... Look demo: http://tlsystem.sourceforge.net