Available for download here.
(No Popot.org mirror yet, because I cannot currently access that site's FTP.)
[Edit: https://www.popot.org/level_editors.php?editor=leapop]
Changes since the last version:
+ The program can now also edit PoP1 for C64 levels!
+ Support for kieranhj 1.1 (B1).
* Workaround for ancient sdl-ttf versions.
* Newer AppleWin, for its -h1.