Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
TP-LINK Archer C5 - TP Link Archer C5 is a great router for less than $100. It supports 802.11ac, has simultaneous 2.4 GHz and 5GHz bands and two USB 2.0 ports for file sharing and storage.
ioBroker - flexible and modular application for the IoT and Smarthome
MIWIFI by Xiaomi - Wifi router beta with a twist: you build it yourself
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Velop - Whole-home mesh Wi-Fi by Linksys