RoomShaker II is a modern Prince of Persia 2 level editor for Windows.
Its official website can be found, via the Internet Archive, here.
Download: RS2_Rel4.zip (2.5MB)
Version 1.15 was released by Brendon James on 6 June 2010.
Wine users may need to install some additional DLL files:
$ winetricks corefonts vcrun6