Research and development in security:
* [Creepy - Geolocation OSINT Tool](http://www.geocreepy.com/) ([package](https://packages.debian.org/wheezy/creepy)).
-* [Qubes OS](https://www.qubes-os.org/).
+* [Qubes OS](https://www.qubes-os.org/):
+ * [Qubes - Debian Wiki](https://wiki.debian.org/Qubes).
+ * [i3 | Qubes OS](https://www.qubes-os.org/doc/i3/).
+ * [Qubes OS 3.2 [LWN.net]](https://lwn.net/Articles/705827/).
* bitmask and LEAP.
* port knocking.
* hardened systems: apparmor, gradm2, firejail, seccomp, etc.