Otto Winter has been continuing his updates to esphome with improvements to the set-up wizard and the addition of min/max settings for rotary encoders (esphome enables you to add an ESP8266 or ESP32 to Home Assistant without writing any code).
Theo Arends has been working on reducing stack space usage in Sonoff-TASMOTA to fix some intermittent crashes. If you’re having issues, please upgrade to version 6.4.1.18 or greater (see this post for more details).
Phil Bowles has been updating the API documentation and examples for his esparto rapid development framework for the ESP8266 (available as an Arduino IDE library; write concise, working code with no setup() or loop() functions).
Xose Pérez has made lots of changes to his espurna replacement firmware for ESP8266 devices over the past few weeks, with support for more than twenty new products added and the incorporation of many fixes (both from Xose himself and submitted by an ever-growing community of users).
Rich Heslip has published an ESP32 project, “Motivation Radio BLEMIDI”, to add WiFi and Bluetooth functionality to Eurorack based modular synthesizers. The hardware for this module is also open source and available from a separate repository, courtesy of Jim Matheson.
esp8266hints 