PlantUML
Create UML diagrams by writing text
PlantUML is an open-source tool that allows users to create UML and other diagrams from plain text.
Markdown Basics
Finally, a developer's markup language for writing
Markdown is a lightweight markup language with plain-text-formatting syntax.
SQL Server Temporal Tables
System-versioned temporal tables in SQL Server
One of the most important new features of ANSI SQL 2011 (ISO/IEC 9075:2011) was defining language enchantments for SQL temporal functionality. Support for SQL Server came with the 2016 version as a "system-versioned temporal tables."