Freedomotic is described as 'open source, flexible, secure Internet of Things (IoT) development framework, useful to build and manage modern smart spaces'. There are more than 10 alternatives to Freedomotic for a variety of platforms, including Linux, Mac, Windows, Self-Hosted solutions and Android. The best alternative is Home-Assistant.io, which is both free and Open Source. Other great apps like Freedomotic are openHAB (Free, Open Source), ioBroker (Free, Open Source), Domoticz (Free, Open Source) and Jeedom (Free Personal).
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.
FHEM (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.
Domogik is a free (GPLv3) Home Automation solution. It allows you to: Controlling your lights, shutters, etc. Monitor your home (temperature, electricity, ...). Create scenarios to make your home more independently. Controlling your home with Voice.
EVA ICS is a platform for automated control and monitoring systems development, for any needs, from home/office to industrial setups. It is completely free for non-commercial use as well as for commercial, on condition that enterprise integrates it on its own.
Nim Home Assistant is an open-source home automation platform running on Nim. Track and control devices at home and automate control. Installation in less than a minute. NimHA is developed to run on small devices, e.g. a Raspberry Pi.