VHDL and Verilog
http://www.uco.es/~ff1mumuj/h_intro.htm

Verilog
https://www.youtube.com/watch?v=6M79Mb7OnM0

g:who developed vhdl
https://www.doulos.com/knowhow/vhdl/a-brief-history-of-vhdl/
The development of VHDL was initiated in 1981 by the 
United States Department of Defence to address the 
hardware life cycle crisis. 
DoD Mil Std 454 mandates the supply of a comprehensive VHDL 
description with every ASIC delivered to the DoD. 

g:who developed verilog
http://staging.doulos.com/knowhow/verilog/a-brief-history-of-verilog/