To Tails Project just released the fourth beta of the live OS Tails 3.0, a live one operating system which runs on every computer and leaves no traces either on the machine or on the internet.
This particular Tails operating system was used by former NSA employee Edward Snowden to stay hidden on the internet.
If you want to help with the Tails Project, the first beta for the upcoming 3.0 version 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.
ORCA repair screen reader.
All the technical details of the changes are listed in Changelog
Download ISO