The best Penetration Testing alternative to Tails is Kali Linux, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Tails and four of them are Penetration Testing Tools so hopefully you can find a suitable replacement. Other interesting Penetration Testing Tool alternatives to Tails are Parrot Security OS, Bugtraq and Pentoo.
Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing, originally forked from Backtrack Linux by the Offensive Security team.
Almost everyone thinks Kali Linux is a great Tails alternative.
Parrot is a GNU/Linux distribution based on Debian Testing and designed with Security, Development, and Privacy in mind.
Parrot OS is free from trackers and telemetry "anti-features", and it provides many privacy tools like AnonSurf, Tor Browser, a custom Firefox profile, easy cryptographic tools and much more.
Almost everyone thinks Parrot Security OS is a great Tails alternative.
Bugtraq system offers the most comprehensive distribution, optimal, and stable with automated services manager in real time.
Pentoo is a security-focused livecd based on Gentoo. It's basically a Gentoo install with lots of customized tools, a customized kernel, and much more.
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Kali Linux is a penetration testing Linux distro that does not come out of the box with Tor routing all network traffic - which is the primary feature of Tails. Although Kali Linux has hacking tools it has no tools for privacy or anonymity.