Open Iconic is an open source icon set with 223 marks in SVG, webfont and raster formats. It is a hyper-legible collection with a tiny footprint and ready to use with Bootstrap and Foundation. These icons are created by P.J. Onori as part of Open Iconic icon set.
Note that installed icons will become available in Icon Chooser dialog and not in the palette.
For this icon set to work properly, make sure that you are using WireframeSketcher 3.6.0 or later.