H. Peter Anvin's repositories
certbot
Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.
SV04-Marlin-2.1.x
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. | Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
SV04-Suicide-Switch-Remix
A remix of bjoern70's "suicide switch" power button for Sovol 3D SV04
Template_MiSTer
Template with latest framework for MiSTer
updiprog
Pure-C utility for programming AVR devices with UPDI interface using a standard TTL serial port
z88dk
The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries.