Here is a list if OS. That can help you to remain anonymous. Note that i haven't used any of the following OS so i don't know how they work but at a same time i' downloading LPS so i will let you know about it after download completes.
Tails:The Amnesic Incognito Live System (Tails) is a Debian-based live CD/USB with the goal of providing complete Internet anonymity for the user. The product ships with several Internet applications, including web browser, IRC client, mail client and instant messenger, all pre-configured with security in mind and with all traffic anonymised. To achieve this, Incognito uses the Tor network to make Internet traffic very hard to trace.
https://tails.boum.org/Lightweight Portable Security (LPS):Lightweight Portable Security (LPS) is a Linux-based live CD with a goal of allowing users to work on a computer without the risk of exposing their credentials and private data to malware, key loggers and other Internet-era ills. It includes a minimal set of applications and utilities, such as the Firefox web browser or an encryption wizard for encrypting and decrypting personal files. The live CD is a product produced by the United States of America's Department of Defence and is part of that organization's Software Protection Initiative.
http://www.spi.dod.mil/lipose.htmLiberté Linux:Liberté Linux is a secure, reliable, lightweight and easy-to-use Gentoo-based live medium with the primary purpose of enabling anyone to communicate safely and covertly in hostile environments.
http://dee.su/libertePrivatix Live-System:Privatix Live-System is a free, portable, encrypted live CD which can be installed on an USB flash drive or an external hard drive. Based on Debian GNU/Linux, it is designed for safe editing and carrying sensitive data, for encrypted communication, and anonymous web surfing (with Tor, Firefox and Torbutton).
http://mandalka.name/privatix/Ubuntu Privacy Remix (UPR):Ubuntu Privacy Remix (UPR) is a modified live DVD based on Ubuntu. Its goal is to provide a completely isolated working environment where private data can be dealt with safely and to protect data against unsolicited access. Networking is intentionally disabled and saving data to mounted volumes is not allowed. The live CD is not installable to hard disk.
https://www.privacy-cd.org/Source:
http://distrowatch.com/