(does not support your operating system)
The app displays tasks in a list in different colors depending on the due date and days ahead you want to be warned. It lets you add new tasks, delete, modify and copy existing tasks. A tasks file can be exported and imported. Also, if several people use the app, tasks can be syncronised with a server.
You can install this directly from the source code using the Fyne command as follows:
go get fyne.io/fyne/v2/cmd/fyne fyne get github.com/midu-SA/Taskmgr/task_app
Or you can download the code directly from git:
git clone https://github.com/midu-SA/Taskmgr.git