Thanks! I had tried Markor already, and its TODO feature seems like a prototype unfortunately. It lacks crucial UI to use it properly and it's clearly visible

Thanks! I had tried Markor already, and its TODO feature seems like a prototype unfortunately. It lacks crucial UI to use it properly and it's clearly visible that the TODO part is "bolt-on" only on top of a text editor. :| With regards to Todo.txt[2]: I can't manage to find its source code, is it open source?