Unsplash

Probably the most well known of the bunch, Unsplash provides a breathtaking gallery of photos with a wide variety of subjects. What sets Unsplash apart is the cooler grey tones, dark overlays and the emphasis on a more retro aesthetic. Whether it’s humans, animals or landscapes that are being depicted, most photographs included could serve to illustrate abstract ideas and concepts, due to their vaguely dreamy vibe. Check out https://unsplash.com/

Kaboompics 

Kaboom pics provides a plethora of photos with many different themes, but the website is mostly focused on work environments and technology, which is quite useful if the subjects you are trying to depict are business or design related. Here you can find photographs of desks, phones, journals and other staples of a busy-persons day, taken from interesting angles and with great lighting. Check out https://kaboompics.com/

Foodies feed 

This one seems pretty self-explanatory. If you’re looking for images that will make your intended audience hungry, Foodies feed is your one stop shop. From beautifully set tables, to incredibly vibrant fruits and salads and craving-inducing shots of burgers and fries, Foodies feed has got you covered. Check out https://www.foodiesfeed.com/

Styled Stock

While no the most abundant source of photographs, Styled Stock offer a unique approach to free stock photography, in that it mostly deals in pastels, rose golds and more feminine themes like spas and make up. A gorgeous selection of desktop photos with carefully styled accents and details makes for some of the most compelling free stock photos available. Check out https://styledstock.co/

Gratisography

Now that's a scary photo right....sorry!

Have you ever needed a photo of a duck with a wig? If you have, Gratisography is the place for you. The website sports some of the most unusual photos, ranging from demon teddy bears, all the way to smoking praying mantises. No, really. So if you’re in need of something to help you illustrate a more bizarre point, Gratisography is absolutely the way to go. Check out https://gratisography.com/

Pexels

Pexels provides high quality and completely free stock photos licensed under the Pexels license. All photos are nicely tagged, searchable and also easy to discover through ther discover pages. Pexels has hundreds of thousands free stock photos and every day new high resolution photos are added. All photos are hand-picked from photos uploaded by the users or sourced from free image websites.

NegativeSpace

Each of the high-quality photographs you find on NegativeSpace has been taken by a photographer from the NegativeSpace community. they have something for everybody, so be sure to check out the categories: Abstract, Animals, Architecture, Business, Black & White, Food, Landscapes, Nature, People, Sport, Street, Technology, Transport, and Work. All of the photos on the site are free. Free in cost as well as free to use under a Creative Commons CC0 license.

Life of Pix

Life of Pix offers free high-resolution photos, no copyrights restrictions for personal and commercial use with new photographs added weekly! All images are donated to the public domain. Discover a fine selection in the featured section, explore the best shot of their photographers of the week or have a quick look on the latest pix uploaded.

iStock Photo

iStock photo gives you an incredibly wide variety of photos, videos and graphics. It offers two types of pricing plans, with credits ranging from 6€ to 9€ per credit, depending on the amount of credits you buy, an monthly subscriptions ranging from 35€ to 339€, depending on the number of downloads and the selection of resources you have access to.

Shutterstock

Shutterstock offers a variety of plans for individuals, teams, and enterprise customers as well as creative editing and collaboration capabilities. It is one of the better known stock websites as it the first global subscription image marketplace, founded way back in 2003. The website has advanced search features, offers curated content, and even has a built-in photo editing platform.

StockSnap

StockSnap offers beautiful, high quality stock photos for just about any use you can think of - including commercial usage - for free. No tricks, no gimmicks, no fine print; just dazzling images for your creative projects. They provide an ever-expanding collection of the best, most beautiful stock images under a single, simple CC0 license that lets you do what you want with all the photos, with no attribution required.