Textual propagation news and dx forcasting on the rsgb website
High quality video series about ham radio
DIY - HamStack Microcontroller Project Platform
From Transmitter to Antenna: HF power transmission theory and practice.
The blog of Peter, ON6TT
Useful list of the new 5 Mhz 60meter band channels and frequencies
This is the best logging software around to use on a linux system.