Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
oandbackup - Make backups of selected apps on your device and restore from those backups.
ioBroker - flexible and modular application for the IoT and Smarthome
Super Backup & Restore - Super Backup & Restore app allows users to backup all their stuff such as pictures, videos, apps, text messages, contacts, call history, and calendar data, etc.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
SyncDroid - SyncDroid is basically and iOS and Android smartphone manager that lets the users of both smartphones to transfer their mobile content from one smartphone to another within few simple steps.