Apps similar to Domoticz include Home Assistant, which is free and open source. Other options are IFTTT, openHAB, ioBroker and Google Home. There's no shortage of Home Automation Tools like Domoticz, with more than 25 alternatives for Android, Linux, Mac, Windows and iPhone.
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.
Germany
EU
Homify is an open-source smart-home platform running on PHP using the Laravel framework. The entire application is built using a modular approach so support for other devices or actions can be implemented easily.
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.
MisterHouse is an open source home automation program. It's fun, it's free, and it's entirely geeky. Written in Perl, it fires events based on time, web, socket, voice, and serial data. It currently runs on Windows 95/98/NT/2k/XP and on most Unix based platforms...
Freedomotic is an open source, flexible, secure Internet of Things (IoT) development framework, useful to build and manage modern smart spaces.
ItalyEU
A connected home app that gives you full control of all your smart devices. From entertainment systems to security, heating and lighting, Gideon Smart Home is working with the leading manufacturers of Smart Home devices to simplify your home connectivity into one app.
United Kingdom
SEQUEmatic lets you build sequences to link together your various smart devices. It also lets you build in unlimited conditions and can use variables to retain information across sequences.
GermanyEU
t6 is an Api ("oriented-Data") + mobile application (PWA) to connect physical Objects with time-series DB. JWT token secured over SSL (https) + signed payload, t6 api and can be used On Premise/SaaS.
CyBear Jinni is smart home platform that let you control smart devices from different form factors with a single app by connecting a Hub in your home.
Israel
Control, automate and monitor your entire smart home with Homey. Access Homey from anywhere in the world and manage all your devices from one central place.
NetherlandsEU
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.
EstoniaEU
