ETS is developed and maintained by the , a consortium of over 500 manufacturers worldwide. The software is not open-source. Its pricing reflects years of R&D, continuous updates (e.g., ETS6, released in 2021), certification of devices, and support for thousands of KNX product databases.
Around €1,200 for a perpetual license (including 1 year of updates). Subscription: ~€50/month. knx ets software free download