egui_dnd
... is a drag & drop library for egui.
Give it a try here: https://lucasmerlin.github.io/hello_egui/#/example/color_sort_vertical
To get started, take a look at the simple example.
Demo Videos:
https://github.com/lucasmerlin/hello_egui/assets/8009393/a05fa961-ef12-479c-a3fd-f765160e048e
https://github.com/lucasmerlin/hello_egui/assets/8009393/4e3b7843-822f-4900-8e8b-d516794590b7