I'm really enjoying koken. I think there is a paid addon to enable passwords, and not sure about different contributor accounts. Pretty sure you can use disqus for comments. Otherwise, great interface and minimilastic, modern presentation and free / self-hosted.
The Lenovo Y50-70 in my sig can be had from the outlet for $650-700; I can't think of a better option for price/performance. I ordered mine with a SSHD and TN panel and easily upgraded both to SSD and AHVA/IPS, respectively for little more after selling the replaced components. You need to be...
Someone should develop an app that encrypts the device with a password that is only revealed upon arriving at certain destination coordinates, or after a certain window of time. Can't unlock it if you yourself don't know the password...