You don't need more tools, you need fewer. And get rid of notifications, sounds, distractions, bouncy icons in the Dock. Mute #general on Slack or Discord. Go minimalist, in work and in life.
I use Todoist. I try to add almost everything I have to do in a day in it, because I enjoy the small release of dopamine when I cross things out, however small they are.
I hate the modern trend of rainbow vomit colour themes in editors. There is no reason to have 25 colours on the screen for keywords, strings, arrays, variables, constants, etc. Consumes too much brain CPU time for nothing, so I tend to prefer minimalistic themes, which are very rare to find.
Brown noise to concentrate, pacing around the house when doing deep thinking, I listen to fast paced psytrance when I'm in the flow but I don't need to think too much. But 99% of the time, silence is better. Nature sounds would be best, still working on it.
Unmedicated I am a person with a ton of great ideas than never go anywhere. Finding a productive balance requires very careful monitoring of diet, medication, mood management, sunlight and sleep. Change one of these slightly, and it's probably going to be an unproductive day.
Lastly, just accepting that 9-to-5 or commuting like a regular person is just not for me. Freelance work is best, because I don't know how to switch off and I get my best ideas whenever I least expect it, like scrolling cat pictures and figuring out the solution for yesterday's problem. The subconscious mind is always working on something.
If you want the best advice I could give you: do not trust your memory. ADHD memory is terrible. Write stuff down. Use calendars, alarms and reminders. Get a small A4 whiteboard and write anything down. DO NOT rely on your memory. Outsource it.