Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trustless, meaning that you need-not inherently trust any entities like root certificate authorities. It uses strong authentication which means that the sender of a message cannot be spoofed, and it aims to hide "non-content" data, like the sender and receiver of messages, from passive eavesdroppers like those running warrantless wiretapping programs.
Bitmessage links:An open source client is available for free under the very liberal MIT license.
https://bitmessage.org/wiki/Main_Page - Bitmessage web-site
https://github.com/Bitmessage/PyBitmessage - Bitmessage project page
https://bitmessage.org/download/ - Bitmessage download page
https://bitmessage.org/wiki/Changelog - Bitmessage change log
https://bitmessage.org/wiki/FAQ - Bitmessage FAQ
https://bitmessage.org/wiki/Protocol_specification - Bitmessage protocol specification
https://bitmessage.org/bitmessage.pdf - Bitmessage white paper (PDF)
http://web.archive.org/web/201407012200 ... n-bitcoin/ - Setting up and using Bitmessage- the article is now available only at Archive.Org
https://bitmessage.ch/- Bitmessage mail gateway
https://bitmessage.org/forum/ - Bitmessage forum
https://pay.reddit.com/r/bitmessage - Bitmessage at Reddit
https://en.wikipedia.org/wiki/Bitmessage - Bitmessage at Wikipedia
http://www.softpedia.com/get/Internet/C ... sage.shtml - Bitmessage at Softpedia
- Bitmessage sent - Bitmessage send - Bitmessage settings To make Bitmessage portable 'Run in Portable Mode' box in settings should be checked. I have tested Bitmessage- it runs fine on my Windows 8 x64 system and it seems to be fully portable. Nowadays when privacy is at risk tools like Bitmessage become more and more valuable in my opinion.