Fantastic line icon set! Not free, but lots of variety and really high quality designs. It would be worth the price for certain projects!
IconAlone Line icons pack by popcic on @creativemarket
#Valentine's Day Flat Line #Icons Mehr
200+ Logistics Delivery Line Icons. Download here: http://graphicriver.net/item/200-logistics-delivery-line-icons/16565816?ref=ksioks
Simple Line Icons (Free PSD, Webfont) by GraphicBurger
Free Line Icon Set - 40 Icons (SVG, PNG, CHS & ICO) #freeicons #freepsdicons…
Single line icons
50 Coffee Shop Line Icons More