Open source is being increasingly embraced by the UN system, governments, and civil society organizations to develop applications to accelerate achieving the sustainable development goals. The sustainability of these projects is of critical importance and requires new frameworks for how open source projects can be maintained through full life-cycle financial support. This session will provide a background of initiatives underway by the Digital Impact Alliance at the UN Foundation, and other ecosystem partners, to support digital public goods and make the case for what institutional support for open source requires. We will address issues related to fiscal sponsorship, community governance, sources of funds, volunteer vs paid contribution, and how decentralized open source communities can connect to centralized control institutions. Will introduce the Govstack initiative to provide context of initiatives underway that promote the use of open source applications for national digital transformation.