Thought I'd share this link as I think I've been using Rainlendar to manage my daily life for at least 15 years now. A great, simple little desktop calendar. The paid version can import from Google Calendar as well, or export to it.
Yep haha. It's been Rainlendar 2 for a few years now, but I don't think I could name anything that actually looks different in version 2.
One of those applications that would only be worse with more features, does everything it needs to and sits quietly on the desktop using minimal resources.
There's now a double-size skin option for high-DPI displays though!