Here is a list of links I stumbled into and found interesting. Usually related to Crypto/Security although it could be anything. You can also suggest me something.

04/06/2015 03/23/2015
Cryptool

www.cryptool.org March 2015

03/22/2015 03/21/2015
Differences between BSD systems

news.ycombinator.com March 2015

Welcome to OpenBSD [pdf]

devio.us March 2015

Network Time Protocol

en.wikipedia.org March 2015

Complexity is the bugdoor's friend

kryptoslogic.blogspot.fr March 2015

UNIX SHELL Quote Tutorial

www.grymoire.com March 2015

03/20/2015 03/19/2015 03/18/2015 03/17/2015 03/16/2015
Chris Peikert: Lamport Signatures

wiki.cc.gatech.edu March 2015

Propose a link