Useful Photos

1. Sources of Free Photos

1.1. Pixabay

1.2. Unsplash

1.3. Flickr

1.4. Unsplash

1.5. Gratisography

1.6. Fancycrave

1.7. New Old Stock

2. Selected Photos

3. Events

3.1. Photos OSFest Paris 2017

3.1.1. Short Selection

3.1.2. Directory to upload your pics

4. Flicker account (all photos)