freedom.js : freedom.js is a framework for building peer-to-peer (P2P) web apps. Easily create social applications that work in modern web browsers, Chrome package...
ZeroDB : ZeroDB enables clients to run queries over encrypted databases without exposing decrypted data to the server and without a proxy gateway.
BlackBox : Safely store secrets in a VCS repo (i.e. Git, Mercurial, Subversion or Perforce).
The Hype Machine : The Hype Machine follows music blog discussions