This document reports the main activities carried out in 2021 concerning the CESSDA Resource Directory (RD). The main activities included the elaboration of a policy and development strategy for the RD, the ongoing maintenance work, and the addition of new resources with a special focus on the inclusion of technical resources, such as tools and services used and/or developed by SPs around data archiving activities. These activities resulted in an increase of 186 resources (+78%) included in the RD for a total of 424 resources in December 2021.