Esp8226

ESP01

eBay suggested these.

and these.

see esp8226

see https://www.schatenseite.de/en/2016/04/22/esp8266-witty-cloud-module/

https://protosupplies.com/product/esp8266-witty-cloud-esp-12f-wifi-module/

https://yoursunny.com/t/2016/WittyCloud-first/ - interesting little module.

https://jpralves.net/post/2016/11/15/esp8266.html - loads of useful information

https://github.com/tasmota/docs/blob/master/docs/devices/Wemos-D1-R1-%26-R2.md - looks intersting

ESP and Thorny

https://thonny.org/ provides a way to use Python and can flash these modules.

NOTE: I found I had to specify the size of the serial ROM to 4MB , Otherwise the little blue light flashed really fast and the REPL

ESP and Arduino

The Arduino IDE can be used.

ESP and ulisp

http://www.ulisp.com/ can be uploaded.