Feather Icons

There are 280+ feather icons and you can get all icons info from here: https://feathericons.com/

Ex. <i data-feather="mail" class="fea icon-sm"> </i>

Material Design Icons

There are 4400+ Material Design icons and you can get all icons info from here: https://materialdesignicons.com/

Ex. <i class="mdi mdi-home"> </i>

Flaticon Icons

There are Flaticon icons and you can get all icons info from here: https://www.flaticon.com/packs/basic-icon

Iconscout (Unicons) Icons

There are 1100+ Iconscout (Unicons) Icons and you can get all icons info from here: https://www.flaticon.com/packs/basic-icon

Ex.
<span class="h3 text-primary me-2">
  <i class="uil uil-0-plus"></i>
</span>