Since the start in 2002 the Wireless Leiden Foundation has established a fast, open and inexpensive wireless community network for the Dutch city of Leiden and surrounding villages. It is an independent network, which technically links up seamlessly to the Internet, but can also be used for free local communication within the Leiden region. Wireless Leiden is a non-profit organisation, operating completely with professional volunteers. All our software, technological and organisational knowledge is freely available to others under an open source license.