I stumbled on this editor while travelling the internets, and thought it might interest the game-makers in the forum. Apparently it's an alternative to Tiled. I know there's some B4X tools that use the output from Tiled, and I have no idea how to do that with LDtk - sorry. I just thought it looked very nice and wanted to share.
Click the animated gifs on the homepage, it really looks like an editor that is lots of fun to work with!
2D level editor for indies from an industry veteran
...or perhaps this is the homepage, I don't know
...
LDtk (Level Designer Toolkit) is an open-source 2D level editor for indie devs, with a strong focus on user-friendliness.