Cartography

• The David Rumsey Historical Map Collection
• Old Maps Online
• The History Of Cartography

Comics

• Alex Cartoon
• XKCD

Computer Graphics

• Inigo Quilez
• Paul Bourke
• Physically Based Rendering: From Theory To Implementation
• Scratchapixel

Computing History

• Ken Shirriff's blog

Computer Science/Systems

• Algorithms for Modern Hardware - Algorithmica
• Eli Bendersky
• Javascript Algorithms
• John D. Cook Consulting Blog
• Linux Kernel Teaching

Education

• Bartosz Ciechanowski

Geography / Natural World

• NASA's Visible Earth
• Natural Earth - Data

Geo-Politics / Military / Conflict

• The War Zone
• War On The Rocks

History

• A Collection of Unmitigated Pedantry
• The Analog Antiquarian
• Rare Historical Photos

Photography

• Digital Photographers Review
• Lens Rentals Blog
• Ming Thein Blog
• Photography Life
• Photons to Photos

Science

• EarthSky
• NASA's Earth Observatory
• NASA's Eyes
• The Space Review
• WorldWide Telescope

Science News

• Nautilus
• Quanta Magazine
• Scientific American
• Science News

Travel / World

• Atlas Obscura
• Exutopia

Weather

• Windy
• Zoom Earth