700,000 lines of code, 20 years, and one developer: How Dwarf Fortress is built - beside me simply liking Dwarf Fortress, 20 years and 700k LOC are amazing and it is always fun to read how a project like this evolved over time. Also the best bugs are cat related :D
HTTP/2: The Sequel is Always Worse - good read outlining the implications of spec compliant downgrading to HTTP/1.1
SAML is insecure by design - SAML is horrible as are many XML based protocols but enterprises like both. The article raises a few good points to keep in mind when working or auditing a SAML library / integration. Take it with a grain of salt, not everything is correct, Google and Facebook are AFAIK not using SAML but OAuth / OpenID.
Towards Inserting One Billion Rows in SQLite Under A Minute - SQLite is an IMHO under appreciated technology which allows you to do amazing things if you are willing to invest a bit time and research.