More sources from http://www.digitalimpact.co.uk

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Magdeleine, http://magdeleine.co/
Public Domain Archive, http://publicdomainarchive.com/
Stokpic, http://stokpic.com/
Good Free Photos, http://goodfreephotos.com/
Pixabay, https://pixabay.com/
StockPhotos, http://stockphotos.io/
StockSnap, https://stocksnap.io/
Kaboompics, http://kaboompics.com/
Picjumbo, https://picjumbo.com/
Pexels, http://www.pexels.com/
re:splashed, http://www.resplashed.com/
Free Images, http://www.freeimages.com/
Life of Pix, http://www.lifeofpix.com/
LEEROY creative agency, http://www.leeroy.ca/en/
Lock & Stock Photos, http://lockandstockphotos.com/
IM Free, http://www.imcreator.com/free
Albumarium, http://albumarium.com/
ISO Republic, http://isorepublic.com/
Nabeel Syed, http://nabeelsyed.com/
Raumrot, http://www.raumrot.com/
Fancy Crave, http://fancycrave.com/
Refe, http://getrefe.tumblr.com/
Superfamous, http://superfamous.com/
SpaceX Photos, https://www.flickr.com/photos/spacexphotos/17127808431/
JÉSHOOTS, http://jeshoots.com/
InstaStock, http://instastock.co/
Stocka, http://www.stocka.co/
Gratisography, http://gratisography.com/
Moveast, http://moveast.me/
SplitShire, http://www.splitshire.com/
Startup Stock Photos, http://startupstockphotos.com/
Travel Coffee Book, http://travelcoffeebook.com/
Foodie’s Feed, http://foodiesfeed.com/
Skitterphoto, http://skitterphoto.com/
Free Nature Stock, http://freenaturestock.com/
Picography, http://picography.co/
Little Visuals, http://littlevisuals.co/
Unsplash, https://unsplash.com/
MMT, http://mmt.li/
Death to Stock Photos, http://deathtothestockphoto.com/
Snapwire Snaps, http://snapwiresnaps.tumblr.com/
Jay Mantri, http://jaymantri.com/
Morguefile, http://morguefile.com/

Ripped straight from digitalimpact.co.uk. Needs deduping.