Centurion technologies - If you are looking for a convenient way to connect your Atari ST/F/FM/E to a VGA monitor, while having a possibility to easily switch between Low/Med and High resolutions,
Make your own Atari to VGA adaptor! - YouTube
Atari ST to VGA Multi-Sync RGB Colour Monitor Cable
ATARI ST VGA FEMALE MONITOR ADAPTER WITH SOUND AUDIO JACK COLOUR 15GHZ ONLY | eBay
VGA I2C Atari 2600 Joystick Expander - My First PCB | Electronics etc…
GitHub - tenox7/tenoxvga: Atari TT High Resolution Mode on VGA Monitor
Atari ST - RGB to VGA conversion - The DEFINITIVE video solution using GBS8220 - YouTube
Atari ST/STE/Mega ST/STE VGA Cable for Color Modes
Free STL file Atari 520 ST Video Adapter Case and PCB - VGA・3D printing design to download・Cults
ATARI ST / STE RGB to VGA video Adapter with AV RCA and JACK - Share Project - PCBWay