I was recently in need of a Mac menu bar Calendar App… After some digging I came across the ones below. Here is a short review of my findings:
iCultus - Free
http://djyde.github.io/iCultus/
Day-0 - Free
http://shauninman.com/archive/2011/10/20/day_o_mac_menu_bar_clock
Day-O is a simple menu bar clock replacement with a simple calendar for your Mac. It’s free, as-is.
Itsycal for Mac - Free
http://www.mowglii.com/itsycal/
Itsycal is a tiny calendar for your Mac’s menu bar.
If you want, it will display your calendar events as a companion to the Mac Calendar app. You can also create and delete (but not edit) events.
On OS X 10.10 Yosemite (but not 10.11 El Capitan*), you can move Itsycal in the menu bar just like the built-in Apple menu extras by holding down the ⌘ key and dragging.
iStats Menu 5 - $18
https://bjango.com/mac/istatmenus/
iStat Menus 5 sports a completely new design — new menubar icons, new dropdown menus, and the app and icon itself have all been redesigned to be cleaner, clearer and more at home on El Capitan and Yosemite. Menubar graphs can now use dark backgrounds, improving legibility.
Bartender 2 - $15
http://sites.fastspring.com/macbartender/product/buybartender2
Bartender 2 lets you organize your menu bar apps. With OS X El Capitan support, updated user interface, and great new features, it’s better than ever.
