If you are looking for a good Design program and don’t want Adobes monthly CC plan or Illustrator.
Take a look at the absolutely fantastic Affinity Designer.
A member of the Affinity forum has shared a HUGE icon pack containing these 11 icon sets:
Entypo+, FontAwesome, Foundation, Game Icons, Gnome Symbolic Icons, Hawcons, Icomoon, Ionic Icons, Material Design Icons, Material Icons, Typicons.
Each containing 300 - 700 searchable icons ready to use direct in Affinity Designer.
It seems Affinity has some price drop during the Apple WWDC so the price is very nice right now.
Sample of the Foundation Icons