Whonix is the most secure pentesting operating system that internet communication based on Tor routing protocol. Users can run the whonix operating system on an external flash drive. Whonix offers hidden IP, leak shield, no logging, virus and malware protection, open source, and Free to use.
LINK: http:/ww.dds6qkxpwdeubwucdiaord2xgbbeyds25rbsgr73tbfpqpt4a6vjwsyd.onion/
To access any onion link, you need to use the Tor browser