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Self-hosted alternative to Trello
(beehaw.org)
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
Beginning of January 1st 2024 this rule WILL be enforced. Posts that are not tagged will be warned and if not fixed within 24h then removed!
Kanboard: https://kanboard.org/
This thing has a ton of features and is worth checking out. There's a zillion options and settings for it too. I use it internally but I'm not sure if it can do the single calendar thing you're asking.
I used Kanboard for years prior to switching to a SaaS product for my sign shop. It was great for tracking the fabrication of projects in different steps.