FHEM is described as '(TM) is a GPL'd perl server for house automation. It is used to automate some common tasks in the household like switching lamps / shutters / heating / etc. and to log events like temperature / humidity / power consumption'. There are more than 10 alternatives to FHEM for a variety of platforms, including Linux, Mac, Windows, Self-Hosted solutions and Online / Web-based. The best alternative is Home-Assistant.io, which is both free and Open Source. Other great apps like FHEM are openHAB (Free, Open Source), ioBroker (Free, Open Source), Domoticz (Free, Open Source) and Home (Free).
ioBroker is an integration platform for the Internet of Things, focused on Smart home, Building Automation, Smart Metering, Ambient Assisted Living, Process Automation, Visualization and Data Logging. It aims to be a possible replacement or extension for software like f.e.
Domoticz is a home automation system that lets you monitor and configure various devices like lights, switches, various sensors/meters like temperature, rain, wind, UV, electricity, gas, water and much more. Notifications/alerts can be sent to any mobile device.
With the new Home app, you can securely control all your Homekit accessories from your favorite iOS device. Have your iPhone turn off the lights. See who’s at the front door from your iPad. And even control things remotely with the help of Apple TV.
Gladys is an open-source program which runs on your Raspberry Pi or Docker. She integrates into your life, seamlessly communicating across your entire home network and your devices while checking your calendar. Based on NodeJS.