Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
tado Smart AC Control - Control any AC from anywhere with your phone
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Nim Home Assistant (NimHA) - Nim Home Assistant is an open-source home automation platform running on Nim.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
My Devices - Drag and drop IoT project builder for Raspberry Pi