All built on my own, with some music help from a friend of mine. Used Unity for ability to easily hit Windows, Mac and Linux. I'll probably get around to porting it to iOS and Android next year too, since feedback has been so strong on Steam, and there's a definite impulse-buy aspect to having lots of colourful cats riding around on trains.
About a year and a half ago I mentioned Autopest in an HN thread titled "Ask HN: How to start earning $500/month in passive income in next 12-18 months?" Since then, it keeps getting featured in Reddit and Quora lists for "best growth hacking tools" and "best sales hacks," and I've also seen it popup on sites like Inc.com and LifeHacker.
I guess Autopest isn't technically passive in the sense that every few months I code a new feature or two based on user feedback, but I also go months without touching it, and more people just keep signing up.
P.S. Here's the original HN thread... some good links to other passive income projects as well: https://news.ycombinator.com/item?id=8246255
Spelling error on your FAQ's - nice product.
If there was a way for autopest to automatically stop when the other party responds to your "pests" (maybe via an email client plugin) I would sign up for sure.
I still kind of count it as "passive" work because I had to learn to develop Gmail plugins for my startup. I was able to transfer that experience to Autopest.
FYI to anyone reading this... InboxSDK is amazing for Gmail plugins.
W3Counter is completely passive -- no new code or features in over a year, no customer support load, autoscaling frontend (EC2) and backend (Aurora). Improvely gets feature updates a few times a year and has some light e-mail support load.
I also added a single banner ad to each of my open source projects' documentation sites, and that's added ~$200/month via AdSense. Developers are surprisingly lucrative targets for advertisers I guess.
Back in the '90s and early '00s, you either had a daily barebones report from a basic log analyzer, or you paid hundreds to thousands of dollars for a license to good analytics software, most of which was just a fancier log analyzer. I never had that kind of money to spend on analytics back then, so I built my own.
My first free "hit counter" with reports service was part of Website Goodies, a site I started around 1996, but didn't have its own domain until 1999. W3Counter was a spin-off of that tool into its own site in 2004.
Google Analytics didn't come about (by acquiring Urchin and making their newest product free) until the end of 2005. Piwik's from late 2007 according to Wikipedia.
Total earnings: 7.35EUR in total from Google Ads
I created it as an alternative to the many printing services that require a dedicated app. OttoPost doesn't require an app since it just searches for your new Instagram photos and prints automatically (that's configurable).
Not exactly world-changing, but definitely something hands-off at this point and better than nothing :)
I really like the price point, but for a 99¢ postcard including postage, do you actually make any money?
Now I'm collecting $1300 a month rent from the other tenant, which covers almost all of the mortgage and taxes. Upkeep isn't that big a deal, since the way my lease was written, I was already responsible for all of the groundskeeping and snow removal when I was renting anyway. Also, it's worth it to make sure you have good tenants, that pay on time, and don't make a mess.
After the initial fixes and repairs we had to do during the purchase process (every home in California has termites), I've been working to automate as much as possible. Here's my "Landlord Stack":
1. Cozy for applications and rental payments (https://cozy.co/) (Price: free)
2. Rocket Lawyer for leases, other documents, and random law questions (https://www.rocketlawyer.com/) (Price: $50/mo)
3. Xero for accounting (https://www.xero.com/) (Price: $9/mo)
4. Trello for organizing information and to-dos (https://trello.com/) (Price: free)
5. We bank at Chase and use their online bill-pay to handle the few utilities we're responsible for.
So for I've had to unclog a couple toilets and fix a window screen. Other than that, smooth sailing so far. Email in profile if you want to get in touch.
The single best piece of advice I can give is to provide a great experience for your guests and have a high price to match that experience. No factor I've found better judges the quality of a tenant than the ability to hand over a big wad of cash.
But I've seen enough stories about nightmare situations that I'd rather cover all my bases before jumping in.
He comes across as a great guy (heard him interviewed on a podcast before I bought the book), has a really readable style (seriously, it makes real estate financials "light reading"), and generally seems focused on helping people (he was apparently teaching when a publisher approached him to write a book - he told them he wouldn't write the book they wanted because he thought it would be useless, but he would write them a book on what he thought would be most useful).
And absolutely: if you're from a comp-sci background, the real estate math is all trivial plug and chug. But it is worth learning the accepted ways of doing things so you can properly compare and model your properties.
Sells a couple Kindle copies per week. In terms of actual income, it's negligible. The feedback has been unanimously positive, so my problem is to get it in the hands of as many people as I can. Therefore, if you want the epub/mobi files, just message me (see bio) and I'll be happy to send them :)
He broke each novel into a four or five book series and sold each book for a dollar. He also made sure to schedule the releases every two to three months. (agile-writing?)
He makes six figures a month on most months 
I started translating it myself but the progress was too slow. I hired a translator, who was a native English speaker. The result is OK but not great -- in the end I could have done an equally good job. So I'll probably be writing the sequel in English.
To answer your question -- I believe the original Spanish version is slightly better.
https://www.retsinformation.dk/Forms/R0710.aspx?id=142348 (official law information in Danish)
What about weight?
Netted me enough income to pay for the data center hosting and a few starbucks coffees per month for myself.
It's not much, but it essentially gives me a free dev area with a ton of computing power for me to roam free.
Decent income in 4 figures, but I didn't do it for the money (it took me hundreds of hours from start to finish). However it's a great feeling when you go out for dinner, check your email, and a new purchase essentially pays for dinner right then and there :P.
Although at the moment it is far from passive (probably spend more time on it than my full time job), but it can be left alone for a little while and still generate income.
-Adsense/Lifestreetmedia on my Pirates FB app (Adsense: $29 this month. Lifestreetmedia: $47 this month) http://greenrobot.com/pirates
-Mopub, Inmobi and Facebook ads on my iOS and Android apps ($14 from Mopub this month)
I've been working on an Appointment Reminder clone for a year now in my home country Austria. I will about break even in 2015, but will have an MRR of ~1500€ in 2016, with low ongoing costs.
So I reckon that in 2016 I can have a pretty passive income (working 5-10hrs/week) of 2000+€ per month. Not that I will work that little because I obviously still want to grow my income. And I also need to add that I've been earning considerably less in the past 3.5 years than I would have if I had stayed employed as a software engineer.
Oh, and then there's the Android app that makes about 15€ per month ^^
How is it that the EU gives grants to for-profit companies? Is it to encourage business growth so the GDP goes up?
I'm talking about a "grant" which seems to imply gratis, free money, as opposed to a loan that has to be paid back, which is available in most countries.
Started it in September and started selling before the watches were made. They're still in production and will be finished soon.
Wouldn't maybe call it "passive income", but the sales keep coming through WOM. (http://gardannewatches.com)
What happens if what you get doesn't match what you're expecting, without an approved sample?
Also, any ballpark on the setup? Or is it per-unit?
(Feel free to demure if you don't want to share, just curious. You see fewer physical than virtual products!)
But, I can't be 100% sure that these watches will be of the same quality, but I'm 99% sure. I've dealed with these manufacturers for a while and we have a tight partnership.
I don't want to misinterpret and give you wrong info, so what do you mean with ballpark? Not sure what you mean :)
By ballpark, I meant could you give round numbers (ie number of figures) on the up-front investment to get something like this off the ground? Or whether it's a back end per-item partnership?
Also, kudos to you and best of luck. It is a nice design, and you're right -- the watch community is under-served by reasonably priced but simple designs. Some of Seiko, Citizen, Orient, and especially Skagen's stuff is nice, but it's amazing how terrible other pieces are.
Some of my favorites are still vintage from the 60s!
I'm really sorry, I can't tell you how much I invested but I can tell you that it was for the first batch and not per-item charging. So you kinda need to invest a lot of money to start something like this - if you want to create great quality products :)
Vintages from the 60s are sooo amazing. We were actually inspired from some vintage watches (and modern watches) :)
What software do you use to design them? Is there an industry standard format that I would need to send manufactures?
I've tried googling around but I have not found anything conclusive.
Is it possible to get the white compass with a black leather strap?
It nets a tiny amount of revenue per month, I'm using it as a testing ground to keep my coding skills sharp, learn meteor and as a case study for growth hacking/product Dev
I run it off a couple of digital ocean droplets at around $10/month
It never made the splash I had hoped; but it's staying power was lots more than any of my previous books and it still gets a bunch of downloads each month.
The series also works great as a way to convinced consulting clients I have the chops to build applications for them.
For those that want to check out the books at the lowest tier; they are pay what you want--even if it is nothing. You can use the code 'hackernews' to get 50% off the higher tiers--I think the real value of the series is in the screencasts.
I'm told the Angular pieces will work independently of the Flex parts.
It might be several hours to fix, retest and update documentation for even a small platform change, so just keeping up with platform changes can be significant effort if you work a full-time job, have children, other commitments etc.
The good news for me is that changes at work are affording me the opportunity to escape some process and re-open some of my side-projects again.
Total income this year: about 5 Bitcoins http://ecogex.com/logos/