Mockupify - Automate your print-on-demand product creation process
Customily - Design, sell and print personalized products the smart way
DesignFlea - The best places to sell design online
Printful - White-label printing under your brand. Free shipping and 20% off samples + 3 day average turnaround.
tapkit - Design bio links that rock
Voodoo Manufacturing - Fast, affordable, high-volume 3D printing