Kinda Ferpy is a restricted, yet convenient interface for functional reactive programming. Signals/events and dependency relationships are implicit in how you write code, making certain kinds of work super convenient and nice.
(require kinda-ferpy)
(define x (stateful-cell 1))
(define y (stateful-cell 1))
(define sum (stateful-cell (+ (x) (y))))
(displayln (sum)) ; 2
(y 8)
(displayln (sum)) ; 9
The implementation model is based on @MaiaVictor's PureState library.