The following Schemes have implementations of property lists:

Scheme	Get property	Put property	Remove property	Get p-list
Chicken	get	put or (setter get)	remprop||symbol-plist
Chez	getprop	putprop	remprop	property-list (returns copy)
Ikarus	getprop	putprop	remprop	property-list (returns copy)
Larceny	getprop	putprop	remprop	(none)
Bigloo	getprop	putprop||remprop||symbol-plist
Guile	symbol-property	set-symbol-property||symbol-property-remove||(none)

Chicken also provides:

• get-properties, which searches for multiple properties simultaneously
• (setter symbol-plist), which replaces the whole property list

Kawa's underlying implementation provides property lists for its Elisp implementation, but they aren't directly exposed to Scheme except through the Java FFI.