Very cool outline vector and psd freebie resource for designers.
Free and simple Line icons for your apps which was created by Robert Karnovski
Format: ai & psd file
License info: maybe CC BY 3.0, but you’d better contact the author if you use it for Commercial Purposes
In zip pack,you will find 2 files: outlinity.ai and outlinity.psd
You can download this freebie from this page