Subway is a (now free!) set of 306 pixel perfect crafted icons. Delivered in PNG, SVG, XALM, PSD, CSH, SKETCH, PDF, AI and EPS formats.
Here is an interesting set made of 50 line icons designed with Photoshop. Free PSD released by Davide Pacilio.
50 PSD line icons
Gemicon v2.0 is a set including 40 vector icons provided in both line and solid versions. Free PSD released by Budi Tanrim.
Gemicon v2.0 icon set
A set of 8 line icons for shopping category. Free PSD designed and released by Taro Huang.
8 Shopping line icons – PSD
A set of 12 outline house icons created with Photoshop vector shapes. Free PSD released by PrimeModule Studio.
12 outline house icons
Here is a small set including 3 vector shaped Christmas icons and released in EPS format. Designed by Dasha.
3 Christmas icons – EPS
A set of 15 vector shaped icons for web. Free PSD (AI and EPS included) by Pavel Kozlov.
15 icons for web – PSD + AI + EPS
Evil Icons is a set of 56 lightweight SVG icons for your web project. Designed and released by Alexander Madyankin and Roman Shamin.
Evil Icons – 56 SVG icons
Christmas is just around the corner and here is a little freebie containing 16 flat Christmas icons. Free PSD designed by Adrian Goia.
16 PSD Christmas icons
LineIkons is a set of 300+ retina-ready icons released by Marco Lopes and created with vector shapes & strokes in order to be easily edited.