Much of the world currently does not have secure property and land tenure rights. Communities and individuals need low-cost tools to enable them to advocate for themselves. The Cadasta Foundation is building an open-source platform to securely enable these groups to document their land rights. This talk will review the design decisions taken into account, the technology underlying Cadasta, and the future road map. Individuals interested in land rights management and/or the challenges in implementing technology in difficult environments will be especially interested in this presentation.