You are a developer and looking for good quality images for your projects or you are looking photographs for school project work. You can try google and other search engines to find more and relevant results but what I like for my work is easy simple download and copyright free images which can be used anywhere even to sell.
Free images are not worthless, they are taken or created in same manner like other images you buy online to get license then use it anywhere. Copyright free high quality images are available online you can download for almost any purpose. Few files having some restrictions but here you can download copyright free high quality images without paying any penny.
When I was looking for photographs it was full of results from top and most visited sites which are premium photographs, if you are a school going kid or just a blogger who need photos for project works then you would like free images and without copyright issues.
pixabay site allow visitors to download photographs without any cost. Images are released into the Public Domain under Creative Commons CC0 that means images can be modified and may be used in any application and also commercially.
I like www.pixabay.com because its copyright free and high quality images, good photographers community. You will find professional photographs and no worry about copyright permission. Use it freely but give respect to them, do not spam. Free images are not worthless.
You can visit here to see quality of images and if you like them or download to use anywhere it would be great to hit donate button, send them money to support their work.