See more at https://bitcointalksearch.org/topic/so-you-want-to-run-a-faucet-934536
Anonymous Ads* - http://www.a-ads.com
Probably the oldest bitcoin ad network still running. Pays based on the amount of views, but is dependant on which advertisers are advertising and their daily budget. I have used this network on all of my bitcoin projects and have been paid by it every time without fail. This ad network is for banner and text ads.
Minimum withdrawal - 0.0001BTC (No fee)
BitMedia* - http://www.bitmedia.io
This network displays both text and banner ads, and also boasts similar rates to Google Adsense. It also runs on a pay per click system.
Minimum withdrawal - 0.01BTC (No fee)
Bee-Ads - http://www.bee-ads.com
Bee-Ads runs on the same system as AdBit, however their minimum bid is only 0.000001BTC. This ad network is only for banner ads.
Minimum withdrawal - 0.001BTC (0.0001BTC Network Fee)
MellowAds - http://www.mellowads.com
MellowAds runs both CPM and CPC campaigns through out it's site. It allows advertisers to place both network and site-specific ads allowing it to reach out to sites of any size. In addition to this, it boasts 0% fees across it's network making it good for beginner sites.
Mimimum withdrawal - 0.001BTC
CoinAdvert - http://www.coinadvert.net
CoinAdvert runs on a CPM (Cost per 1,000 views) system, mixed with the bidding system used in AdBit and Bee-Ads. An advertiser pays for 1,000 views or more for a price you set, and you get paid per view on that ad. This ad network is only for text advertising.
Minimum withdrawal - 0.002BTC (0.0001BTC Network Fee)
AdBTC - https://adbtc.info
This network runs on a network share system where publishers get money for their share of the impressions/clicks. In addition to this, this network allows advertisers to place a free ad on their network.
In order to be accepted into this network, you must add the code to your page and email the owner of the site (as is explained on their FAQ Page).
Adalso - http://adalso.com/
This network runs similarly to MellowAds, as it allows CPC ads broadcast over the network and bidding on specific sites. This network is only for banner ads.
CPMLeader - http://www.cpmleader.com
An ad network that pays by a CPM system. You get paid for every unique impression every 24 hours.
Minimum withdrawal - $5 via Paypal
very nice list!