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I just use Remind, which is the best calendar app ever. If you aren't happy with the calendar on Thunderbird, do you maybe want to take the step to using a full project management app, like ~~ProjectLibre~~, GanttProject, Gnome Planner, et. al?
ProjectLibre sounded interesting, but they're pushing their subscription SaaS product hard. That kind of mindset doesn't bode well for it's future. I would look elsewhere. The term "libre" doesn't belong on paid subscriptions.
What makes Remind awesome?
It's terminal (well, has a gui if you want) based, which always is a big plus for me. It allows for a lot of tinkering. Here's a link to the website FAQ, is you want more. Username/Password == notabot/notabot
If you like tinkering, customizing your .*rc files, then you'll probably enjoy it. If you don't like the terminal or tinkering with txt files, then your mileage may vary. Although the Tcl/Tk gui is pretty user friendly.