Ask HN: Your best passive income sources?
I really like building developer tools and kind of miss doing it full time. I built a tool for testing/playing with REST services last year and sell it on the OS X app store:<p><a href="http://www.uresk.net/httpclient/" rel="nofollow">http://www.uresk.net/httpclient/</a><p>I'm not getting rich off it, but it usually brings in a few hundred bucks per month and I like hearing from fellow developers who benefit from using it.