Freepto is described as 'A Linux-based operating system on USB stick, easily persist your encrypted data on it. Use any computer as it was your own, leaving no trace. Use the Internet anonymously' and is an app in the OS & Utilities category. There are four alternatives to Freepto for a variety of platforms, including Linux, Thunderbird, Tor, Tor Browser Bundle and VeraCrypt. The best alternative is Tails, which is both free and Open Source. Other great apps like Freepto are Whonix (Free, Open Source), Linux Kodachi (Free, Open Source) and BunsenLabs (Free, Open Source).
Whonix is a desktop operating system designed for advanced security and privacy. Whonix mitigates the threat of common attack vectors while maintaining usability. Online anonymity is realized via fail-safe, automatic, and desktop-wide use of the Tor network.
Kodachi is a Debian-based distro which can be run from a DVD or USB thumb drive. It filters network traffic via a VPN and Tor, obscuring the user's location. It attempts to clean up after itself, removing traces of its use from the computer.
BunsenLabs Linux is a distribution offering a light-weight and easily customizable Openbox desktop. The current release is Helium, built on top of Debian (stable). The project is a community continuation of CrunchBang Linux.