Well there is but I don't know if I'd trust it, frankly. Periodic Calendar. Open source and licensed under the GPLv3. Thing is I don't think it's maintained anymore; the most recent version was released 7 years ago, and the most recent copyright date I've found was from 2013. Source: almost 2 years ago
Do you know an article comparing Periodic Calendar to other products?
Suggest a link to a post with product alternatives.
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