The Evidence Synthesis Hackathon’s online Evidence Synthesis & Meta-Analysis in R Conference (#ESMARConf) was held on January 21st and 22nd 2021. A total of 39 presentations, 10 panel discusisons and 4 workshops covered a wide variety of different tools and use cases for evidence synthesis and meta-analyses in R. 514 people registered for the conference, and so far >1,100 unique viewers have watched the conference videos, totalling over 4,100 views. All of the individual talks, panel discussions, workshops and livestreams are available for free on the . The conference is not only relevant for people developing packages, but also experienced and novice R users wanting to know what might be available. Find out more at the ESH website: https://www.eshackathon.org/events/2021-01-ESMAR.html.