'Let's Encrypt is a free, automated, and open certificate authority (CA), run for the public's benefit. Let's Encrypt is a service provided by the Internet Security Research Group (ISRG).'
Simply search for a keyword of what your wish to make or work with to see the tools
& related Web 2.0 links available (example search links:
mashups, blogging, viral videos, clipart, designing, social tagging,
AJAX apps, file
storage/sharing, RSS
feeds,
anti-spam tools, CSS layout
generators, image
editors,
DHTML codes,
webmaster tools,
calendars, data
organizing,
calculators, file
conversions,
Atom,
sync, blog (URL)
submits, web
APIs,
tutorials, etc).
"Enigmail is a security extension to Mozilla Thunderbird and Seamonkey. It enables you to write and receive email messages signed and/or encrypted with the OpenPGP standard."
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