I'm a long-time user of free/open source software, and write various things for both fun and profit. I don't take myself all that seriously and I do all of my own stunts.
You can find me at these fine establishments on the web: Open Source Musings, The Monday Kickoff, Weekly Musings. and The Plain Text Project.
Authored Comments
No one tool is going to be perfectly suited for everyone's purposes. One of the reasons I like WeKan is that it is basic — it contains the features I need and use.
If you're looking for other open source Trello alternatives, you might want to check out this article by Jason Baker. The article looks at a couple of the tools you mentioned, a couple of others too.
F-Droid is fantastic, and the app's not too bad. But the website doesn't offer as good an experience as Fossdroid. As you said, though, it's nice to have both.