Business Type Examples
PTCs  Optimalbux ❀ Scarlet-ClicksGPTplanet 
 Paid Online Surveys 
Swagbucks ❀ Clixsense  Prize5
 Traffic Exchanges 
EasyHits4U ❀ LeadsLeap TrafficAdBar
URL Shorteners
Adf.ly
Social Networks CashJuice
Affiliate Marketing
Amazonassociate  eBay TripleClicks
Marketing Courses WealthyAffiliate
Websites Builders Site123  SiteRubix ❀ Bluehost
Ads Networks Google Adsense

 Note/ Those clickable companies names contain affiliate links