Negative Space is a great new website for discovering high-resolution free stock photos. What really makes this site a little different is that whilst you can download the images in the usual JPG format, you can also download the original RAW file.
This means with the RAW file you can non-destructively re-process the image in Lightroom or Adobe Camera Raw and then create your own final JPG if you wish. All images are provided with a CCO licence so they can be used for commercial projects without any worries.
Visit negativespace.co to get started.