For me this is <a href="https://www.LinksSpy.com" rel="nofollow">https://www.LinksSpy.com</a> - a CRM for getting white-hat inbound links.<p>I started it in April 2014 and it's making about $1,000/month. Haven't invested time into it (busy day job) in the past 2-3 months. I've got a bunch of ideas how to grow it, but time is a serious constraint
Commencepayments.com, costs me $40 a month to run (though if I wasn't lazy I could drop it significantly - $20 for heroku + ssl and $20 for cloudflare) launched last February and just hit the $1000 mark!
Mine is <a href="http://www.watermark-image.com" rel="nofollow">http://www.watermark-image.com</a> a windows downloadable watermarker - oldschool but still making more than $1000 a month :)<p>I am using the income to help fund my new project <a href="http://timeblock.com" rel="nofollow">http://timeblock.com</a> a resource/time management and project overview system that is made with a makers schedule in mind!
My most enjoyable is williseeashark.com and the point hasn't been profit as it's really a passion project. It looks at shark behavior along the California coast by compiling data from scientists, social media and fishing/whale watching boats. I have quite a bit planned for it in the future.
Does this question only cover products? I was doing side work for two companies, and I quit my job of 8 1/2 years to go full-time independent, doing automation and sysadmin stuff for them, have a couple more customers coming on too. Gave myself a HUGE increase _after_ taxes and insurance.<p>To clarify, I have signed contracts that are committing to certain lengths of time. It's not something that I would have quit my day job for, without a significant part of the risks mitigated.
Mine is <a href="http://www.boxo.coffee" rel="nofollow">http://www.boxo.coffee</a> - monthly coffee exploration.<p>Started this while living in Hong Kong as a way to bring in coffee from the popular roasters in the USA, and expanded to the states within 8 months. Good times so far, and it's still a side project. Used the profits from the HK side of the business to launch USA side.
$0, but my most successful is definitely standardresume.co.<p>I'd be interested to hear how people with profitable side projects went from side project to profitability.
<a href="http://jekyllthemes.io" rel="nofollow">http://jekyllthemes.io</a> - 3 months old and making ~$50/mo through Adsense and affiliate links. Hosting is free for the next year from AWS and the domain is $30/year.