I knew I had this somewhere :)
Here’s a list of free stock photos that you can use commercially – always check the terms of stock photo websites and make sure any photo you use without paying is ‘Creative Commons’.
(Then you won’t get a sudden invoice from a photographer or get sued for copyright…)
Most of these have a more tech slant – the list is from my work at Telefonix.
Since then, I found THIS awesome round-up for stock photos of people of colour.
Best Free Stock Photos:
Good Free Photos
Every Stock Photo – this is in theory ALL stock photos from across the web.
Flickr – This varies per photo. Creative Commons is free for all to use. Flickr is making a lot of changes. Double check before you use anything.
Second Choice Free Stock Photos:
(mostly on second tier through tech filter, could be better for you)
Negative Space (very tech)
MMT Stock (more tech)
New Old Stock (old photos / historical I think)Pixabay (lots of graphics and vectors)
Stock Vault (older stuff)
Cupcake something (banners and backgrounds)
Public Domain Archive (probably older)
Life of Pix
Paid Stock Photos:
Shutterstock (we had an account)
Alamy (I think some are free, you need to check individual photos)