Spacewolff - P2P marketplace for ads. Turn excess space into ad space.
Startup Stash - A curated directory of 400 resources & tools for startups
StickerRide - Let your car earn money through advertising
The Influencer Marketing Stack - Free resources to launch a killer campaign
Grabb-It - Location-based ads on your Uber's window
Makerbook - A directory of the best free resources for creatives