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GIS

Symbols

• SVG Repo
• Free SVG Image & Icon. | SVG Silh
• Free Mapbox Maki icons
• Temaki icons

Symbol design

• Inkscape Tutorials Blog

Colors

• ColorBrewer
• Color Hex

Blogs

• Free and Open Source GIS Ramblings | written by Anita Graser aka Underdark

Online tools

• Geocoder service HAS Hogeschool