GitHub

Did not know that existed. I am compiling my own.
Seems to be an overlap but I also have others not listed.

I guess its better to have more than less!

A few more

github.com/markdavidlong (AppleSAWS - toolkit for exploring DOS 3.3 disks)
github.com/museum-of-art-and-digital-entertainment/macross (assembler used for SCUMM for Lucasfilm Ltd)
github.com/datajerk (utilities - read binary files and output to dos, convert binary files to audio files to use cassette interface)

The source code to ORCA/C is now available on github.
It also includes the linker and libraries.

github.com/byteworksinc

Here is a disassembly of graphic interface the A2 desktop
(128K Apple IIe and IIc)

https://github.com/inexorabletash/a2d

A build pipeline for making Apple II software on OS X.

https://github.com/jeremysrand/Apple2BuildPipeline

He also has other Apple 2 related projects.

Now this is interesting.
He has 3 repositories.

a) Supermacs - Merlin Assembler Macros for the IIGS
b) ResLin - Apple IIGS GS/OS resource manipulation utility
and
c) Python application that detects and highlights the heart-rate of an individual (using only their own webcam) in real-time.

I am interested in b) ResLin. Except when I click on it
there are no files except the license and Readme files.

Has it been removed? Or is it hidden somewhere?

The link is below.

github.com/roughana

If anyone can find more information on this
account, please post.

Cross-platform command-line tool for manipulating and managing Apple II DSK (and other) images.

- ProDOS (8 & 16)
- DOS (13 & 16 sector)
- RDOS
- Pascal

github.com/paleotronic/dskalyzer

A miniature Apple II for those how cannot
afford the real thing or just want a miniature version!

https://github.com/Cupcakus/AppleIIMini

Somebody has finally done it!!
I was wondering how long it would take.
It is a handheld Apple IIe. (emulator)
Now you can take your
Apple on the go.
Take that gameboy!

https://github.com/prickle/gamebloke

Beneath Apple DOS on github
A version of the book and also
source code of Don Worth's Programs.

Also has other Apple related projects
which have been re-forked.

github.com/iKarith/beneath-apple-dos

SD Card based Profile replacement for IIe and IIGS
Apple II Mouse
(schematics, docs, manual etc)
and others

github.com/freitz85

Source code from the disassembly of Apple ProDos Assembler package
(Edasm)

Disassembled source code of ProDOS 8 v2.03 in Merlin assembler format

Source code from the disassembly of Apple DOS Modula2 Interpreter package

github.com/markpmlim

various utilities from 4am

passport - copy program
4live - editor
a2fc.system - graphics file viewer for Apple II
standard delivery - single sector fast boot loader
WeeGui - GUI library for Apple II

github.com/a2-4am

pon-gs
Apple IIGS pong game. Written in 65816.

cadius
Disk imaging utility (ProDOS) forked from Brutal Deluxe

github.com/mach-kernel

Open Source Scan Converter
board designed for connecting retro video game consoles and home computers into modern displays

github.com/marqs85/ossc

Apple IIe emulator written in JAVA
Includes all resolution modes and Mockingboard Support
Runs all Windows, Mac OSX and Linux

Game - Lawless Legends Open Source

github.com/badvision

PLASMA
Proto Language Assembler for Apple (V1.1)

Apple II Character Generator

github.com/dschmenk

partial revesere engineering of Apple II emulation disk for disk ///

github.com/brouhaha

Visual Studio make files for the Apple II using CC65 for Merlin32 + other Merlin32 resources

github.com/olivierguinart

This looks to be interesting.
An Incircuit Emulator for 6502, 65C02, Z80 and 6809.
github.com/hoglet67/AtomBusMon

I don't think this has been tested on an Apple II as yet.

A command-line tool to convert Apple II DSK images to WOZ format

An emulator of the Acorn Electron, Amstrad CPC, Apple II+, Atari 2600, ColecoVision, Commodore Vic-20, MSX 1, Oric 1/Atmos and Sinclair ZX80/81.

github.com/tomharte

An 8-bit algorithmic languange for Apple II, C64, Vic 20
Includes:
Interpreter
Bytecode compiler
Virtual Machine
Bytecode disassembler

github.com/bobbimanners

If you feel like minesweeper for the Apple II, it
has now been done.

see
github.com/option8/minesweeper

Speedy J
Pointless post.
I have not missed the post and
I am aware that Microsoft has bought Github.
But currently this is the largest resources of
repositories for the Apple II that I can find.
If in the future people decide to move to another
service (ie. bitbucket) then I'll have a list for that.

The point is give current information of projects
that are going on or in development and keep
the Apple II in use.

This account has alot of information for the Apple II.
Books
Programming
Music
Games with docs
Educational
Repair
Diagnostics
Disk Labels
and loads more.
github.com/rlowke/lowkemedia/

AsmGen
6502 assembly code generator for sprites, fonts and images (Apple II and Atari)
Written in Python with documenation

github.com/robmcmullen/asmgen

There are alot of other interesting repositories on his site also.

16bit Forth System

https://github.com/cstrotm/volksForth

Notepad++ Syntax Highlighting for 6502 Assembly

https://github.com/tragicmuffin/6502-npp-syntax

Emulate Apple II on arduino uno.
https://github.com/dpeckett/arduino-appleii

Analyst debugger for Apple II
https://github.com/retrogear/Analyst

Collection of code for using an Apple ImageWriter II with a modern computer
https://github.com/dellagd/Apple-ImageWriterII

UNIDISK 3.5 Apple II co-processor in Merlin Assembler https://github.com/rigreco/Unidisk If you like games, then there is a map of Sword of kadash https://github.com/bogbert/sword_of_kadash_map a web-based reproduction of the classic Apple II game Wizardry https://github.com/blzabub/wizardry-web Apple II emulator for the Amiga https://github.com/kkralian/Apple2000

FIG Forth model for Apple II 6502

https://github.com/ForthHub/FIG-Forth

Apple IIgs reverse engineer tools

https://github.com/mrkite/regs

Apple II Snake game written in 6502 Assembly

https://github.com/alonf/Apple_IIe_Snake

Converts an RGB image (.png, .jpeg) into a binary file compliant with the Apple II's HIRES format.

https://github.com/Pixinn/Rgb2Hires

A simple board to connect a 16-pin Apple II joystick to the 9-pin connector on the back of Apple IIe and later computers.

https://github.com/ppelleti/A2JoystickAdapter

Apple II Joystick to USB Adapter

https://github.com/stratosonic/Apple-II-Joystick-to-USB-Adapter

Apple II emulator for Nintendo DS

https://github.com/LemonBoy/grape

Apple II system monitor-style hexdump

https://github.com/simonboak/hexmon

Creating a functional gate level Apple II from Apple II schematic

https://github.com/fred6502/Apple-II-Gate-Level-Xilinx-ISE-14.7-Schematic-Entry

Print Shop Companion

https://github.com/photogrammer/PrintShopCompanion-Apple-II

Music Graphics Demo

https://github.com/meladroit/Undertale_AppleII

This one has loads of repositories

hombebrew game
image encoder
Apple Disk II address field scanner
ProDOS BASIC.SYSTEM commands

github.com/a2geek

A reverse engineered game of Muse's Robot War

https://github.com/richardharrington/robotwar

Apple IIgs Drawing program for chemical structures
HGR Character Generator for the Apple //

github.com/codebur

Another site with loads of Apple II programs

A command to copy files in BASIC.SYSTEM on an Apple II
Experimentation with custom fonts on HGR screen
Shows all online volumes on an Apple II computer
Implementations of POSIX command line programs for machines targeted by the cc65 compiler

github.com/gungwald

Apple IIGS / 65C816 disassembler written in PHP
CIFS implementation for the Apple IIGS using Marinetti TCP/IP stack
Apple IIGS sound library

github.com/cshepherd

Tuning an Apple Extended Keyboard II

https://github.com/cfenollosa/aekii

Transform 2D coordinates with an Apple IIGS

https://github.com/Luigi30/transformer

A tile-based game engine for the Apple IIgs written in 65816 asssembly language
Utility to generate 65816 compiled sprites using informed search methods

github.com/lscharen

Software Janitor

Thanks for the entries you posted and new reference for
rlowke that is now moved to apple2bandonware.

Here are my latest finds:

Master directory for Apple Programming Language Objective C II

github.com/nednal12/APLOC2

Apple II Trash Dove (A Double Lores / BMP2DHR Tutorial)

github.com/mouse6502/mktrashdove

Apple ][+ implemented in VHDL for FPGAs

github.com/mandl/Apple_II_vhdl

Apple II DOS Source Code

github.com/dynamicwebpaige/AppleII_DOS

Software for the SDISK 2 Disk II emulator for Apple II computers

https://github.com/rbanffy/sdisk2

Various Apple II related projects.

https://github.com/nategri/apple2

Apple ][+ implemented in VHDL for FPGAs

https://github.com/mandl/Apple_II_vhdl

Apple II related projects

https://github.com/damauk/Apple2

This entry is quite recent.

A general purpose ASM libriary for the Apple II. Assembled in Merlin 8 Pro

https://github.com/nathanriggs/AppleIIAsmLib

Full-speed lores video playback on the Apple II-series computers.

https://github.com/frankmilliron/apple-II-videos

CC65 Lo-Res graphic library for the Apple II

https://github.com/pedgarcia/a2graph

A Lunar Lander Game written in Applesoft Basic for the Apple ii.

https://github.com/jonathonwebb/appleii_lander