Mainly my apple 1 emulator based on Mike Chambers 6502 emulation code.
Links:
https://wiki.reactivemicro.com/images/e/ec/LearnToProgramAnApple1.pdf
https://bitsavers.trailing-edge.com/pdf/apple/apple_I/AppleI_BasicMan.pdf
https://github.com/ebruchez/apple1-party/tree/main - tools and libs using cc65 to build apps for apple 1
https://github.com/petersieg/napple1 - nice apple 1 emulator using ncurses
f-gen.zip - simple frequency generator; just arduino uno required - python tkinter gui on PC
dramarduino.zip - 4164/41256 DRAM Tester with Arduino UNO
pw_freqcnt.zip - frequency counter
A1replica.zip - Apple 1 replica gerber files - see: https://www.applefritter.com/content/apple-1-replica-gerber-files
And the revised A1replica file: Rev. 3 Modifications of Russian A1 By Logan Greer.zip see: https://www.applefritter.com/content/rev1-modifications-russian-apple-1-files and: https://www.applefritter.com/content/modifications-russian-apple-1-project-finished