Here is a list of some CSS accordion menus.
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Accordion Menu
Dev: alphardex
Accordion Menu
Dev: Mario Melchor
Advanced Accordion Menu
Dev: Daniel Paradise
HTML + CSS Only Accordion
Dev: Alina N.
Accordion Menu Using Only HTML & CSS
Dev: Okba Design
Pure HTML+CSS Accordion (Without Javascript)
Dev: Dandi Wiratsangka
Swanky Pure CSS Drop Down Menu V2.0
Dev: Jamie Coulter
Accordion Menu + Tooltip
Dev: mori
CSS Only Vertical Accordion Menu
Dev: Eriksen
Pure CSS Accordion Menu (No JavaScript)
Dev: The Code Father
Lo-fi Tailwind CSS Accordion Menu
Dev: Rob Stinson
Bootstrap Accordion Menu example with icon
Dev: Andreas Eracleous
Accordion Multi Menu
Dev: Alex
Awesome accordion menu using only HTML & CSS
Dev: Ahmad Emran
Accordion Menu
Dev: Ahmad Emran
Hamburger slide accordion menu
Dev: Anya Melnyk
Pure Css Accordion Menu
Dev: Anz Joy
Accordion Menu
Dev: Agustin Ortiz
Accordion menu
Dev: JuliaRietveld
CSS Accordion
Dev: Theodore Kluge
Accordion Menu
Dev: Benjamin