This particular functional Tails was used by former NSA employee Edward Snowden to remain hidden on the internet.
If you want to help develop the Tails Project, the first RC for the upcoming 3.0 version has just been released and is available for testing.
How can you help? Of course mentioning them errorthe ones you meet in the project developers.
The Tails 3.0 RC1 will be the first version of Tails based on Debian 9 (Stretch) and will feature GNOME Shell 3.22 as the preferred skin work:
"The first candidate version of the upcoming version 3.0 is released. We are very excited and can't wait to hear what you have to say about this. Tails 3.0 will upgrade virtually all included software.
Changes from Talis 3.0-beta4 include: Important security fixes.
Upgrade to current Debian 9 (Stretch). Upgrading Tor to 0.3.0.7.
We will provide security updates for the Tails 3.0-rc1, just like for the stable versions of Tails.
Note that this is a trial version. We tried it and it works, but it may even contain issues that have not been discovered. "
You will find more in official announcement
All the technical details of the changes are listed in Changelog