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Onetastic

Current version: 3.2.3
November 10, 2016 - Changelog

Choose the version based on your OneNote installation, not Windows. If you are using 32-bit version of OneNote choose 32-bit, otherwise choose 64-bit, regardless of your Windows bitness.
Download Onetastic 32-bit Download Onetastic 64-bit

OneCalendar

Current version: 1.17.5
November 10, 2016 - Changelog

OneCalendar is already part of Onetastic. If you still want to have it as a standalone tool and keep it on your desktop or pin it to your taskbar, you can do so here.
Download OneCalendar

 

If you don't know what version of OneNote you are using you can find it out from within OneNote.
For OneNote 2010:
Click on File > Help in OneNote and check the version on the right side where it says something similar to:


For OneNote 2013/2016:
Click on File > Account in OneNote and then click on About OneNote on the right side and check the first line in the dialog that comes up which should say whether it is 32 bit or 64 bit at the end.

System Requirements