This is a Haxe 4 compatible fork of deltaluca's Nape 2D physics engine.
A mirror of the no longer available Nape website can be found here: https://joecreates.github.io/napephys/
haxelib install nape-haxe4
Or from GitHub:
haxelib git nape-haxe4 https://github.com/HaxeFlixel/nape-haxe4 master haxelib