I recently wrote a big (400 pages, 160 listings) book on Go for Éditions Dunod: https://osinet.fr/go because I've been using Go in various projects since 2012 and have been teaching it at https://eemi.com since 2018, along with production technologies since 2020
Most of my Open Source work has been on Drupal since 2005: https://www.drupal.org/user/27985, as a core maintainer (XML-RPC). I've been giving talks at all kinds of Drupal events in the EU and USA. Find my slides on https://speakerdeck.com/fgm and https://www.slideshare.net/fgm-osinet
I also contributed to MongoDB, Meteor, Doctrine (MongoDB ODM), Monolog, Silex and many smaller projects.