I don't have a github account but here are my suggestions:
https://www.ambient-mixer.com/ because it has a bunch of nice setups based on various fandoms as well as more generic themes.
Tody (chore tracker app) - alternatives are Regularly, or Sweepy. I find Tody the best for household chores. Regularly is best if you want to include non-house recurring items or just prefer a cleaner UI without clutter. I haven't used Sweepy.
Sleep as Android - Sleep tracker + smart alarm with barcode scan function (helps me get out of bed) - Alarmy is a free alternative.
Russell Barkley's new youtube channel @russellbarkleyphd2023 and also all of his books, his website, his old youtube talks etc, and this interview, which is old but brilliantly concise: https://www.pbs.org/wgbh/pages/frontline/shows/medicating/interviews/barkley.html
Struggle care / @domesticblisters - content about self-care, organisation and household tasks. Explicitly neurodiversity-friendly.
A Slob Comes Clean / all this author's books - cleaning, decluttering, organisation (and, not explicitly, but I've found the habit-forming info and advice is transferable to other areas). Not explicitly ADHD focused but the author describes a lot of ADHD traits very well.
Dr. Ross Greene and the Lives in the Balance foundation. It's actually parenting advice, but I find the "Kids do well when they can" / "People do well when they can" approach very helpful in reducing ADHD shame.
AI chatbots can help in breaking down tasks, suggesting a schedule, offering basic counselling, meal planning, instant feedback/praise for completed tasks etc. For instance chat GPT, or the Snapchat AI.
There's also goblin.tools which is specifically for breaking tasks down.
Smart But Scattered Adults (book about executive functioning)
So You Mean I'm Not Crazy, Stupid or Lazy?! (good primer book about ADHD, especially but not exclusively for women)
The ADHD Workbook for Teens by Allison Tyler - great for working through with diagnosed teens, possibly also for anyone on the younger end themselves (e.g. still studying/living at home).
YNAB for budgeting - this is unfortunately expensive, but it is the best one that works for me - there's a subreddit to learn more. Some free alternatives at MoneySavingExpert in their budgeting section.
I've probably forgotten some, but I need to go out.