To Tails Project just released the first beta of the live OS Tails 3.0, a live one operating system which runs on every computer and leaves no traces even on machine but not on the internet either.
This particular Tails was used by a former NSA employee Edward Snowden to remain 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 Tails based on the Debian 9 (Stretch). So all applications will be upgraded to newer versions.
Other changes:
An 64-bit processor is now required
Redesigning Tails Greeter.
Redesigning the Tails Greeter alpha screenshot
GNOME Shell was set to use its black theme as its default.
Many problems have been fixed by Tails 3.0 ~ alpha1.
All the technical details of the changes are listed in Changelog
Download ISO