I don’t think you’re going to find a Markdown app that has those capabilities, I haven’t seen one and I follow those kinds of apps pretty closely. The closest option would probably be Curio, it’s not specifically a markdown app but a quick search of their forums seems to indicate that there is some kind markdown support. It’s a bit pricy depending on your needs, probably a lot broader in scope than you’re looking... Source: almost 3 years ago

Leantime (https://leantime.io). It connects strategy boards to execution and is focused on being really easy to use. Source: about 1 year ago

I don't know if these are multi-tenant projects but you could certainly explore them: leantime.io and openproject.org. Source: about 1 year ago

We're using Leantime (https://leantime.io) for this. It's really straight forward so I don't think they would need to fuss going into other areas to manage a task. Source: about 1 year ago

Leantime (https://leantime.io) does everything you just mentioned and gives you a little more room to grow if you need it. The claim is to be for the “non-project manager” so good for non-technical teams or teams looking for something to get in and get out of. Source: about 1 year ago

Deck is very minimal and not really suited for anything beyond simple, personal stuff, in my opinion. As far as self-hosted, my favorite is still Kanboard, which has a lot of plugins and themes to choose from. Leantime is good too and a bit different. I also like Vikunja and Wekan. Source: over 1 year ago