How many poker aids can you name?

Saw someone ask about a gto program or something here on the forum and they said they had a few other aids to help them along.

Was wondering how many of these programs or aids to improve your game can we come up with?

During a hand or away from the table.

I'll start and just say poker books.

I'm guessing there are at least 10 items on the list

Download Flopzilla and use it for off the table study.

Huds
Hand databases so we can analyse our game
GTO solvers to look at specific spots
GTO trainer/practice modes
Coaches
Courses (free one here, paid ones too)
Watching streamers/youtubers to pick up tips
Online articles
Basic hand vs. hand calculators
Basic hand vs range calculators
Starting hand charts
Peer review - ask a friend, post hands online for analysis as we can do here on Cardschat, join a study group
Flopzilla - already mentioned

Probably many more.