You'll have to leave your house for this one, but hospitality consulting firms like Coyle rely on secret shoppers to evaluate their clients' services. Sign up to be an evaluator and you could get paid to receive spa treatments, dine at restaurants or stay at a hotel. There are lots of opportunities in other fields, too, ranging from entertainment (hello, amusement parks!) to automobiles. However, watch out for scams; check the MSPA for a list of legitimate mystery shopping companies. Earning potential: About $10 per hour
MMOGs emerged from the hard-core gamer community to the mainstream strongly in December 2003 with an analysis in the Financial Times measuring the value of the virtual property in the then-largest MMOG, EverQuest, to result in a per-capita GDP of 2,266 dollars which would have placed the virtual world of EverQuest as the 77th wealthiest nation, on par with Croatia, Ecuador, Tunisia or Vietnam.
Do you do a ton of shopping but don't always keep track of prices after the fact? Did you know that prices online change all the time, and most merchants have a price guarantee program? Paribus is a service that lets you find out if stores you’ve shopped at online owe you a refund.  It’s free to sign up. Paribus connects to your email account and checks your receipts.  If they find out a retailer has dropped their price they file a price adjustment claim for you.
This is the classic work-at-home mom gig, but it's for a lot more people than just moms! Selling stuff you love can be a great way to make extra money from home, even if you work in an office most of the day. Direct selling is scalable to your own lifestyle, ambition, and talents. You can keep it casual and mostly sell to friends and acquaintances. Or, if you really get to networking online and in person, you can build a client base outside your existing circles.
The first follows the startup path we outlined above: You have a disruptive idea for an app or piece of software, you validate the idea with real customers, and then raise money to hire developers or a development studio to build, launch, and scale your software. If you’ve done everything right, your software will be accepted to the Apple and Google Stores and you’ll make money every time someone downloads it or pays for a premium feature.
Massively multiplayer online real-time strategy games, also known as "MMORTS", combine real-time strategy (RTS) with a persistent world. Players often assume the role of a general, king, or other type of figurehead leading an army into battle while maintaining the resources needed for such warfare. The titles are often based in a sci-fi or fantasy universe and are distinguished from single or small-scale multiplayer RTSes by the number of players and common use of a persistent world, generally hosted by the game's publisher, which continues to evolve even when the player is offline.
Start a website or blog. Sure, competition in the online world is steep, but one thing that makes a good site or blog stand apart is the dedication and enthusiasm of its writer. Plenty of sites focus too hard on SEO and keywords, and while SEO-optimization is certainly necessary to help your content make money, delving into something that truly matters to you will set you apart from your fluff-and-stuff competitors.

During the last year I’ve worked with the Swedish research group who is building a map of how all human proteins are distributed in our bodies, the Human Protein Atlas. It is a huge database of millions of images, that over 100.000 researchers use every month to understand human biology better, to fight diseases and to create more efficient drugs. But for the images to be useful, they need to classify the patterns and localise the corresponding protein. >>>

The initial goal of World War II Online was to create a map (in north western Europe) that had real world physics (gravity, air/water resistance, etc.), and ability for players to have some strategic abilities to its basic FPS/RPG role. While the current version is not quite a true simulated world, it is very complex and contains a large persistent world.

Rescue battered wood. Pallets and pallet stock are cheap (or free) and easy to come by. Look for untreated specimens at construction sites, community colleges, buildings under renovation, or shipping warehouses and plane them down and/or kiln-dry them in a homemade kiln-dryer to uncover their hidden beauty. You can then resell the wood as is or even turn it into beautiful furniture. (Be sure to advertise that the wood is “reclaimed,” as people are often willing to pay much more for this.)
Your Price. When establishing a price for your classes, start by calling around and finding out what other choices your clients have. If you plan to offer cooking classes, call some commercial establishments and other in-home teachers. Compare your own talent and experience to what they’re offering, and set a price accordingly. You should always come in a little lower than classes offered by commercial establishments as that will be one of your selling points: expert information for less money.

Whether you have a website or are still dreaming up ideas for a blog, you can also look into affiliate marketing. With affiliate marketing, you partner with brands and businesses within the content of your website. If you mention a product or service, you link to that produce or service using a unique affiliate code you received when you signed up for that particular affiliate program. From there, you’ll make money any time someone buys a product or service through your link.

Matched Betting (not available in the USA) enables you to gamble (nearly) risk-free. I say nearly as there is always room for error! It involves placing bets on all outcomes of an event, using free online bets given out by the Bookies. Although it may take a while to get your head around the concept, Matched Betting can make a substantial addition to your monthly income.
 Use your home to work from home. If you live in an area where there is a demand for short-term rentals (like near a university or the downtown of a large city), you may well be able to find renters by networking in your community. However, with the rise of Airbnb and places like it the Internet has once again made it much easier to make money from home. Using these sites you can rent out a private room, shared room or even your whole house for a night or month or whatever period of time you like. 

Whether you know how to flawlessly apply eye makeup or build a wooden shelving unit, you can create an online course or video for others to follow. Websites like Udemy and Teachable allow you to build a course, such as how to learn a new language or write a cover letter. Once you build your course and set the price, there’s little work to be done. You’ll receive residual income from each person who signs up to take your course.
Try affiliate marketing. This means promoting someone else’s products or services for pay without actually carrying an inventory. There are many ways of incorporating affiliate marketing into your website/blog/page including banner ads (which are generally ineffective, as people tend to avoid these), linked articles (which are quite successful when the article content is thoughtful and doesn’t appear spammy), and product-placement videos (which can be very successful when done by people with charisma or a good sense of humor). You can even become an affiliate marketer without a website. Basic ways of making money through of affiliate marketing include:
According to Care.com’s study, the average hourly babysitting rate in San Francisco, for example, is $16.65, compared to the national average of $13.44 an hour. In practice though, there are many child care jobs available that pay $18 / hour or more, and if the parents are okay with bringing their children to your house, you can have multiple children at once, bringing up the hourly pay considerably.
I recently stumbled on the Trim app and I have to say, this one is a game changer. It’s a simple app that acts as your own personal financial manager. Once you link your bank to the app, Trim analyzes your spending, finds subscriptions you need to cancel, negotiates your Comcast bill, finds you better car insurance, and more. And of course, the app is free! My bet is that it will only take a few days for Trim to put an extra $100 in your pocket. So easy!
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