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The Tor software protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning your physical location, and it lets you access sites which are blocked.

I2P is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties.

Freenet is free software which lets you anonymously share files, browse and publish "freesites" (web sites accessible only through Freenet) and chat on forums, without fear of censorship. Freenet is decentralised to make it less vulnerable to attack, and if used in "darknet" mode, where users only connect to their friends, is very difficult to detect.

GNUnet is a framework for secure peer-to-peer networking that does not use any centralized or otherwise trusted services. A first service implemented on top of the networking layer allows anonymous censorship-resistant file-sharing. Anonymity is provided by making messages originating from a peer indistinguishable from messages that the peer is routing. All peers act as routers and use link-encrypted connections with stable bandwidth utilization to communicate with each other. GNUnet uses a simple, excess-based economic model to allocate resources. Peers in GNUnet monitor each others behavior with respect to resource usage; peers that contribute to the network are rewarded with better service. »

Mesh routing protocol designed to handle a massive amount of nodes with very low resource consumption. Thanks to this feature it can be easily used to build a worldwide distributed, anonymous and uncontrolled network, separated from the Internet, without the support of any servers, ISPs or authority controls.

ThePirateBrowser is a bundle package of the Tor client ( Vidalia ), Mozilla Firefox Portable browser (with FoxyProxy addon) and some custom configs that allows you to circumvent censorship that certain countries such as Iran, North Korea, United Kingdom, Belgium, Finland, Denmark, Italy and Ireland impose onto their citizens.

LibreMesh is a set of modules extending the OpenWrt router distribution to create self-configuring wireless and wired mesh networks.

Digitata is an open-source ad hoc routing network that welcomes membership and contribution by others.

qaul.net implements a redundant, open communication principle, in which wireless-enabled computers and mobile devices can directly form a spontaneous network.

Project CCNx is sponsored by the Palo Alto Research Center (PARC) and is based upon the PARC Content-Centric Networking (CCN) architecture, which is the focus of a major, long-term research and development program. There are interesting problems in many areas still to be solved to fully realize and apply the vision, but we believe that enough of an architectural foundation is in place to enable significant experiments to begin. Since this new approach to networking can be deployed through middleware software communicating in an overlay on existing networks, it is possible to start applying it now to solve communication problems in new ways. Project CCNx is an invitation to join us and participate in this exploration of the frontier of content networking. »

SMesh is a seamless wireless mesh network being developed by the Distributed System and Networks Lab at Johns Hopkins University. It provides peer-to-peer connectivity, Internet connectivity, and fast handoff to mobile clients across the mesh. Clients get connected automatically through standard DHCP. No software or drivers need to be installed on the mobile devices. SMesh takes care of providing end-to-end connectivity transparently for the clients.

WING is an open-source Wireless Mesh Networking platform aimed at hobbyists and enthusiasts.