I've been developing this 2D tile map editor and I just added a new isometric feature. Hope you like it.
Source Code: https://github.com/victorqribeiro/tileEditor
Live version: https://victorribeiro.com/tileEditor/
YouTube Playlist: https://www.youtube.com/watch?v=iZzxaNkQPCw&list=PL3pnEx5_eGm88UxHH2OlzRRdnj7zT6Cla