Open source represents a model generally known for its success in software production. The objective of this article is to establish a new strategic approach of using open source development principles for managing collaborative arrangements between citizens and public administration. The identity of open source governance is developed by highlighting how it is different from its main “competitor”—collaborative governance, and from other two popular concepts—open government and e-democracy. The other sections are designed to answer to public managers regarding why and what to adopt from this governance model for public sector services.