After finding out that tools that are to “bureaucratic” don’t stick with me (bureaucratic as in, I need to fill out forms to create projects/tasks, update them and follow defined workflows), I ended up with Trilium.
It at first looks like a very free-form note taking app (a tree of documents on the left, click and edit away), but it has a lot of extra functionality that lets you construct journals and tasks lists in the document tree (like its Task Manager which is already set up in the Demo notes of a new Trilium install).