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Skulls is a Multi-Network WebCache in PHP used from p2p clients to bootstrap. It is used mainly for Gnutella/Gnutella2 but it can work with any networks (after configuring vars.php). It use text file to store data so it doesn't require SQL.
Cachechu is an efficient GWebCache written in PHP for the Gnutella2 (G2) network. Cachechu is designed using GWebCache version 2 specifications.