# iSG Required Add-Ons

- [Home Assistant Server](/isg/using-isg/add-ons/isg-required-add-ons/home-assistant-server.md)
- [How to Manually Start the Home Assistant Server](/isg/using-isg/add-ons/isg-required-add-ons/home-assistant-server/how-to-manually-start-the-home-assistant-server.md)
- [MQTT Broker](/isg/using-isg/add-ons/isg-required-add-ons/mqtt-broker.md): The iSG MQTT Broker add-on serves as a message queuing middleware for devices within the local area network, responsible for receiving, storing, and forwarding messages.
- [Zigbee2MQTT](/isg/using-isg/add-ons/isg-required-add-ons/zigbee2mqtt.md): With this Add-on, it can better support the setup of Zigbee devices from different brands and categories to iSG.
- [How to Manually Configure Zigbee2MQTT](/isg/using-isg/add-ons/isg-required-add-ons/zigbee2mqtt/how-to-manually-configure-zigbee2mqtt.md)
- [Z-Wave JS Ul](/isg/using-isg/add-ons/isg-required-add-ons/z-wave-js-ul.md)
- [Others](/isg/using-isg/add-ons/isg-required-add-ons/others.md)