Sku Grid - Sku Grid helps marketplace sellers to be competitive and keep in sync with various suppliers. Lots of different suppliers are supported, including retail ones for drop shipping. Sku Grid works with eBay, Amazon, Shopify, Bonanza, Woo and others
Interfacer - Collection of more than 200+ free design resources
eSagu - eSagu is a RePricing software for the Amazon and eBay marketplace.
Facebook Design Resources - A collection of free resources made by designers at Facebook
HyperSKU - Shopify dropshipping App - sourcing directly from factories, 7-12 days express shipping, and automated system.
Freebiesbug - Collection of the best free web design resources.