We will very briefly introduce Beernet's architecture describing the peer-to-peer network topology, the distributed hash table, and the transactional layer for replicated storage (called Trappist). We will also describe Beernet's API to create peers, exchange information between them, and to store and retrieve data from them. We will finally describe some applications built on top of Beernet, such as a small wiki, a collaborative drawing tool, and a web-base recommendation system.