A robust national forest monitoring system (NFMS) enables countries to align their forest policies with up-to-date, reliable, transparent and accessible information. NFMS knowledge and results support countries in their efforts to build  confidence in climate actions, and increase the effectiveness and transparency of those actions under the Paris Agreement. In this context, the ability to freely and easily access innovative and open-source tools and technologies becomes crucial for any country eager to efficiently formulate, implement and monitor forest-related policies and track progress towards sustainable forest management. The FAO elearning Academy webinar “Forest data and free open-source solutions for Climate Action” will highlight the ways in which forest monitoring tools support climate action, share experience from countries and present a new open-source solution for collecting and analysing forest data.