Bored of circular icons? Try verticons....
Verticons has a unique shape and high quality icons. Complements 18:9 and higher aspect ratio screens. Verticons loosely sticks to material design guidelines and makes use of material design palette and vibrant colors.

This is the free version of Verticons icon pack with about 1400 icons included and masking support. Supports dynamic calendars on select launchers.
Compatible with most modern launchers [does not support Atom launcher and LG launcher]

Regarding Donations: There is an option to donate in the app which you should avoid and buy the paid version of this app if you want more features and icons. Only donate if you support and value the existence of this free version

Recommended icon settings:
120% to 140% icon scaling

Additional benefits of the PAID version:
🔸More than 3600 icons with regular updates
🔸Priority (paid) as well as Regular icon requests (based on number of requests)
🔸Custom made wallpapers
🔸Folder icons
🔸Alternate color and design versions for many apps
🔸Constantly evolving with updates to old icons