I may have missed it in which case please can we make it easier to find. Is there a log somewhere or webpage someone maintains with a full list of Mautic Plugins? Would be a nice thing to have and curate.
We have https://www.mautic.org/marketplace but this only includes plugins on Github and where the author has asked to be included. The one that @joeyk mentions is more extensive but you will need to check for Mautic 3.x compatibility.