Burst - Burst has thousands of hi-res photos that are free to use.
Snaptivity - Real-time photo sharing with the world nearby
LGBTQ Pride by Burst - Royalty-free photos celebrating LGBTQ pride month.
Flashgap - Time-delayed photo-sharing app of last night's embarrassment
HER - The app for lesbian, bisexual and queer people
Slingshot - Quickly share everyday moments with lots of people at once