Interstellar Medium:

• Galactic Extinction (SFD 1998 and many others), now available via pip install dustmaps
  
• Leiden/Argentine/Bonn HI survey
  
• CO surveys
  
• H-alpha / Free-Free Emission
  
• WMAP Galactic Haze
  
• Fermi LAT Maps
  

3D Dust Projects:

• 3D dust map: main page and data release
  
• Cloud Distance Catalog
  
• Orion Dust Ring
  
• APOGEE reddening law
  
• 2D map, integrated to 4.5 kpc
  

Galaxy Surveys:

• Pan-STARRS
  
• Sloan Digital Sky Survey
  
• Sloan Digital Sky Survey match to SIRTF First Look Survey
  

NASA Goddard Sites:

• Fermi Science Support Center (Fermi Gamma-ray Space Telescope)
• LAMBDA Archive - WMAP, COBE
• Skyview

IDL code:

• IDL code maintained by David Schlegel