Features:

• very low lag
• sharp and defined upscaling, comparing well to other -expensive- units
• no synchronization loss switching 240p/480i (output runs independent from input, sync to display never drops)
• on demand motion adaptive deinterlacer that engages automatically and only when needed
• works with almost anything: 8 bit consoles, 16/32 bit consoles, 2000s consoles, home computers, etc
• little compromise, eventhough the hardware is very affordable (less than $30 typically)
• lots of useful features and image enhancements
• optional control interface via web browser, utilizing the ESP8266 WiFi capabilities
• good color reproduction with auto gain and auto offset for the tripple 8 bit @ 160MHz ADC
• optional bypass capability to, for example, transcode Component to RGB/HV in high quality

Supported standards are NTSC / PAL, the EDTV and HD formats, as well as VGA from 192p to 1600x1200 (earliest DOS, home computers, PC). Sources can be connected via RGB/HV (VGA), RGBS (game consoles, SCART) or Component Video (YUV). Various variations are supported, such as the PlayStation 2's VGA modes that run over Component cables.

Gbscontrol is a continuation of previous work by dooklink, mybook4, Ian Stedman and others.

Bob from RetroRGB did an overview video on the project. This is a highly recommended watch!

Head over to the wiki for the setup guide to learn how to build and use it!
Build the hardware

Development threads:
https://shmups.system11.org/viewtopic.php?f=6&t=52172
https://circuit-board.de/forum/index.php/Thread/15601-GBS-8220-Custom-Firmware-in-Arbeit/