To Tails Project just released the fourth beta of the live OS Tails 3.0, a live operating system that runs on every computer and leaves no traces either on the machine or on the medianetwork.
This particular Tails operating system was used by former NSA employee Edward Snowden to remain hidden in Internet.
If you want to help the Tails Project, the first beta for the upcoming version 3.0 has just been released and is available for testing.
What's new;
Tails 3.0 will be the first version of Debian 9 (Stretch) based Tails. So all apps will be upgraded to newer versions.
Other changes:
Significant security improvements
All the changes he brought Tails 2.12
Upgrade to the current Debian 9 (Stretch)
Many bug fixes in Tails Greeter.
Fix the ORCA screen reader.
All the technical details of the changes are listed in Changelog
Download ISO