How do you sell ads on open source code ? I know about ubuntu and firefox but was wondering if there are startups doing open source work and generating revenue. I know about core os but have no clue on how they generate revenue.
The code just shows ads. Users are free to get rid of them, but you hope they don't; perhaps you encourage them not to. (Note: webpages are often the same way; users can run AdBlock if they want.) If advertisers pay only for click-throughs to their site, then they know they're not getting ripped off.
> I know about ubuntu and firefox but was wondering if there are startups doing open source work and generating revenue.
Well, you said "famous". Once you're famous, you're often not a start-up any more. In any case, I can't think of any, but then I'm not really into the start-up scene.