Note: Links on this page use the anonym.to service.
Freenet is a decentralized, censorship-resistant distributed data store originally designed by Ian Clarke. Freenet aims to provide freedom of speech through a peer-to-peer network with strong protection of anonymity. Freenet works by pooling the contributed bandwidth and storage space of member computers to allow users to anonymously publish or retrieve various kinds of information. From a user's perspective, it can be thought of as simply a large storage device.
Official website: http://freenetproject.org/
A freesite is a web page on Freenet. It usually consists of a collection of files in a single manifest, and therefore accessible from the same key. USKs are most commonly used, to allow for updates, but any key type is possible. The simplest way to create a freesite is probably to build it using your favorite HTML authoring tool, and then upload it using jSite. Linking to freesites can be done using an Activelink.
Frost is a message board system for Freenet. You can create private or public boards, upload/download files, and send encrypted messages.
Official website: http://jtcfrost.sourceforge.net/
How to run frost: Either run the frost.bar or frost.sh (bat for windows, sh for *nix) or run the jar via java:
java -jar frost.jar