openthinclient
2.0 out of 5 stars (based on 1 review)
openthinclient is a ThinClient OS with centralized management. With network boot and web-based UI, x86-compatible devices can be quickly and easily provisioned as VDI endpoints. openthinclient is completely open source and can be tested and used free of charge with a limited number of clients without restrictions. The management server is Java-based and runs under Windows or Linux.
There are trackers on the website and obviously the software is not trade-free, but available on a restricted basis (you can buy it with money): https://openthinclient.com/thin-client-software-vergleich/