http://dds6qkxpeiqvogt4y2fd7vtsxq6pvokekb2h4la7jd4iwl4ljuawu5qd.onion/wiki/I2P
The Syndie Technical Features section notes: [25] On the whole, Syndie works at the *content layer* - individual posts are contained in encrypted zip files, and participating in the forum means simply sharing these files. There are no dependencies upon how the files are transferred (over I2P , Tor , Freenet , gnutella , bittorrent , RSS , usenet , email ), but simple aggregation and distribution tools will be bundled with the standard Syndie release.