Vikunja is great. You can self-host it or use their hosting plan. It has different views (Kanban, List, Table and Gantt).

Joplin

if you're asking about for a team, i'd recommend redmine or open project. if for an individual i'd recommend pen and paper, org mode, or logseq (in that order). as far as pen and paper systems go, i like bullet journaling because it combines mindfulness self care with the the trappings of a productivity tool. japanese planners like the hobonichi on kokuyo jibun are also excellent at this. the other direction to go is to do a kanban wall just like what trello is simulating

Kanboard: kanboard.org

Closest thing to Trello that I know.

https://github.com/mattermost-community/focalboard

Focalboard is a good alternative Sadly it doesn’t seem to be maintained at the moment.

For Personal To-Do List & Habit Tracker I use Habitica it’s pretty cool :)

i use planka and it's good.

Check out FSNotes 🇺🇦

I use Todoist, which is Portuguese, iirc, and I'm pretty happy with it. Can even tier my tasks on level of importance.

Deck in Nextcloud. www.murena.io is free up to 1Gb

There are too many to list, as everyone and their mother include a kanban-style board now. Included by default in NextCloud. Trivial to host standalone versions are also relatively plenty. Basically I'd look for someone that fills other needs, it'll probably come with one anyway.

Thanks for the correction, was going off the flag on AlternativeTo and missed that detail.