My only feedback is to commend the author on including a "Similar projects" section in the README file. I love when authors are not afraid to compare their projects to other similar pieces of work.
In fact, there already is such a (okay, rather short) section in the README [0].
But I plan to incorporate the other tools mentioned here.
Only the feature comparison table with all of these tools against all of the features mentioned here will have to wait, I am afraid...
[0]: https://github.com/arnehilmann/markdeck#similar-projects