I would like to introduce you our project here as well. Not long time ago I have discovered ESP8266 and started experimenting with it. Time passed and I approached my friend, skilled electronics designer. It didn't require long persuading to talk him into this project. So we started work on our own IoT HW, which we wanted from beginning to open source, now is the time. Project took few months in total including waiting for components to arrive. Without further ado more information could be gathered from project GitHub page
https://github.com/ArnieX/swifitch
If you have questions do not hesitate to ask them