Business models based on the compiled list at http://news.ycombinator.com/item?id=4924647. I find the link very hard to browse, so I made a simple version in Markdown instead.

business-models.md

Business Models

Advertising

Models	Examples
Display ads	Yahoo!
Search ads	Google
Text ads	Google
Video ads	Hulu, Twitch.tv
Audio ads	Pandora, Radio, Podcasts
Promoted content	Twitter, Tumblr
Paid-content links	Outbrain
Recruitment ads	LinkedIn
Lead generation	MoneySuperMarket, ZocDoc
Affiliate fees	The Wirecutter
Classifieds	Craigslist
Featured listings	Yelp, Super Pages;
E-mail ads	Yahoo, MSN
Ad-retargeting	Criteo
Real-time-intent ad delivery
Location-based offers	Foursquare
Sponsorships/Site take-overs	Pandora
Lifetime, unique ad space	NSFWCORP Conflict Tower, milliondollarhomepage.com
Sponsorships	Twitch.tv users

Commerce

Models	Examples
Retailing	Zappos
Marketplace	Etsy
Crowd-sourced marketplace	Threadless
Excess-capacity markets	Uber, AirBnB
Vertically-integrated commerce	Warby Parker
Aggregator	Lastminute.com
Flash sales	Gilt Groupe, Vente Privee, Fab
Group buying	Groupon
Digital goods/downloads	iTunes
Virtual goods	Zynga
Training	Cloudera(?), -> Coursera
Pay what you want	Radiohead
Commission	SharesPost
Commission per order	Seamless, GrubHub
Auction	eBay
Reverse Auction	Priceline
Barter for services	SwapRight

Subscription

Models	Examples
Software as a Service (SaaS)	Salesforce
Service aaS	Shopify
Content aaS	Spotify, Netflix
Platform aaS (PaaS)	dotCloud, Heroku
Infrastructure aaS (IaaS)
Freemium SaaS	Dropbox
Ethical premium	Proposed by Clayton Cubitt
Donations	Wikipedia
Recurring donations (w/ rewards)	Patreon
Sampling	Birchbox, BarkBox (sic)
Membership services	Amazon Prime
Support and maintenance	10gen, Red Hat, Cloud66
Paywall	New York Times, Andrew Sullivan
Strict Paywall	The Information
Porous Paywall	NSFWCORP
Voice and video conferencing	Uberconference
Newsletter	Ricardo Bueno
Fremium video subscription	Twitch.tv, YouTube

Peer to Peer (P2P)

Models	Examples
P2P lending	Lending Club
P2P gambling	BetFair
P2P buying	Etsy
P2P insurance
P2P computing	CrasPlan storage, SETI@home
P2P service	Mechanical Turk, TaskRabbit
P2P mobile WiFi/tethering

Transaction-Processing

Models	Examples
Merchant acquiring	PayPal (On-/Offline), Stripe (OnL), Square (OffL)
Intermediary	IP Commerce (POS 2.0), CardSpring
Acquiring processing	Paymentech
Bank transfer	Dwolla
Bank depository offering	Simple, Movenbank (spread on average deposits)
Bank card issuance	Simple (interchange fee per transaction)
Fullfilment	Amazon
Messaging	Peer-to-Peer SMS, IM, Group Messaging
Telephony (public networks)	Skype out/in
Telephony (private cloud)	Native Skype
Mobile payment gateway	Braintree
Platform monetization (“tax”)	Facebook Credits, iOS 30/70 cut

Licensing

Models	Examples
Per seat	Sencha
Per device/server	QlikView
Per application instance	Adobe Photoshop
Per site	Private cloud on internal infrastructure
Patent	Qualcomm
Brand	Sesame Street
Indirect	Apple Volume Purchasing

Data

Models	Examples
User data	BlueKai
Business data	Duedil
User intelligence	YouGov
Search Data	Chango
Real-time consumer intent data	Yieldbot
Benchmarking services	Comscore
Market research	GLG

Mobile

Models	Examples
Paid-app downloads	WhatsApp
In-app purchases	Zynga Poker
In-app subscriptions	New York Times app
Advertising	Flurry, AdMob
Digital-to-physical	Red Stamp, Postagram

Gaming

Models	Examples
Freemium (virtual currency)	Zynga
Subscription	World of Warcraft
Premium	Xbox games
DLC (downloadable content)	Call of Duty
Ads	addictinggames.com

Open Source

Models	Examples
Consulting	Red Hat, Nginx, Revsys
Support
Hosting/Infrastructure	WordPress
Free for some, but not for others
Ads	Mozilla
Bundled features (e.g. search)	Mozilla, Opera

plaintext-aligned-columns.mdown

The list in monospaced <pre> code (with aligned columns) might be easier to read:

Business Models
===============

Advertising
-----------
Display ads                        | Yahoo!
Search ads                         | Google
Text ads                           | Google
Video ads                          | Hulu, Twitch.tv
Audio ads                          | Pandora, Radio, Podcasts
Promoted content                   | Twitter, Tumblr
Paid-content links                 | Outbrain
Recruitment ads                    | LinkedIn
Lead generation                    | MoneySuperMarket, ZocDoc
Affiliate fees                     | The Wirecutter
Classifieds                        | Craigslist
Featured listings                  | Yelp, Super Pages;
E-mail ads                         | Yahoo, MSN
Ad-retargeting                     | Criteo 
Real-time-intent ad delivery       |
Location-based offers              | Foursquare
Sponsorships/Site take-overs       | Pandora
Lifetime, unique ad space          | NSFWCORP Conflict Tower, milliondollarhomepage.com
Sponsorships                       | Twitch.tv users

Commerce
--------
Retailing                          | Zappos
Marketplace                        | Etsy
Crowd-sourced marketplace          | Threadless
Excess-capacity markets            | Uber, AirBnB
Vertically-integrated commerce     | Warby Parker
Aggregator                         | Lastminute.com
Flash sales                        | Gilt Groupe, Vente Privee, Fab
Group buying                       | Groupon
Digital goods/downloads            | iTunes
Virtual goods                      | Zynga
Training                           | Cloudera(?), -> Coursera
Pay what you want                  | Radiohead
Commission                         | SharesPost
Commission per order               | Seamless, GrubHub
Auction                            | eBay
Reverse Auction                    | Priceline
Barter for services                | SwapRight

Subscription
------------
Software as a Service (SaaS)       | Salesforce
Service aaS                        | Shopify
Content aaS                        | Spotify, Netflix
Platform aaS (PaaS)                | dotCloud, Heroku
Infrastructure aaS (IaaS)          | 
Freemium SaaS                      | Dropbox
Ethical premium                    | Proposed by Clayton Cubitt
Donations                          | Wikipedia
Recurring donations (w/ rewards)   | Patreon
Sampling                           | Birchbox, BarkBox
Membership services                | Amazon Prime
Support and maintenance            | 10gen, Red Hat, Cloud66
Paywall                            | New York Times, Andrew Sullivan
Strict Paywall                     | The Information
Porous Paywall                     | NSFWCORP
Voice and video conferencing       | Uberconference
Newsletter                         | Ricardo Bueno
Fremium video subscription         | Twitch.tv, YouTube

Peer to Peer (P2P)
------------------
P2P lending                        | Lending Club
P2P gambling                       | BetFair
P2P buying                         | Etsy
P2P insurance                      | 
P2P computing                      | CrasPlan storage, SETI@home
P2P service                        | Mechanical Turk, TaskRabbit
P2P mobile WiFi/tethering          | 

Transaction-Processing
----------------------
Merchant acquiring                 | PayPal (On-/Offline), Stripe (OnL), Square (OffL)
Intermediary                       | IP Commerce (POS 2.0), CardSpring
Acquiring processing               | Paymentech
Bank transfer                      | Dwolla
Bank depository offering           | Simple, Movenbank (spread on average deposits)
Bank card issuance                 | Simple (interchange fee per transaction)
Fullfilment                        | Amazon
Messaging                          | Peer-to-Peer SMS, IM, Group Messaging
Telephony (public networks)        | Skype out/in
Telephony (private cloud)          | Native Skype
Mobile payment gateway             | Braintree
Platform monetization (“tax”)      | Facebook Credits, iOS 30/70 cut

Licensing
---------
Per seat                           | Sencha
Per device/server                  | QlikView
Per application instance           | Adobe Photoshop
Per site                           | Private cloud on internal infrastructure
Patent                             | Qualcomm
Brand                              | Sesame Street
Indirect                           | Apple Volume Purchasing

Data
----
User data                          | BlueKai
Business data                      | Duedil
User intelligence                  | YouGov
Search Data                        | Chango
Real-time consumer intent data     | Yieldbot
Benchmarking services              | Comscore
Market research                    | GLG

Mobile
------
Paid-app downloads                 | WhatsApp
In-app purchases                   | Zynga Poker
In-app subscriptions               | New York Times app
Advertising                        | Flurry, AdMob
Digital-to-physical                | Red Stamp, Postagram

Gaming
------
Freemium (virtual currency)        | Zynga
Subscription                       | World of Warcraft
Premium                            | Xbox games
DLC (downloadable content)         | Call of Duty
Ads                                | addictinggames.com

Open Source (FOSS)
------------------
Consulting                         | Red Hat, Nginx, Revsys
Support                            | 
Hosting/Infrastructure             | WordPress
Free for some, but not for others  |
Ads                                | Mozilla
Bundled features (e.g. search)     | Mozilla, Opera

Thanks for this

Nice stuff! Thanks

Thanks for this information!
It would be awesome if you update it with the comment suggestions, especially IaaS and Video Ads.

Awesome list! Thoughts on categories for the open source section folks are talking about in above comments:

Open Source (Freemium):
Software companies who provide a free, open source (note: not FOSS) baseline product and monetize conversions to an augmented premium version.

Example: Cloudera, MapR, AlienVault

Open Source (Consulting Services):
Software companies focusing on monetizing expertise in deploying an open source suite or developing a customized version of that suite for customers.

Example: Red Hat, 10Gen, Nginx, Hortonworks

Open Source (Hosting/Infrastructure Management Services):
Software companies who monetize the hosting and/or continued management of an open source software suite.

Example: Wordpress.

Open Source (Class or Usage Licensed Premium):
Software companies who provide and develop open source software for free and monetize its use by a certain class of customers (e.g.: free for educational use but not for professional use), by its inclusion in a certain type of product, or in its use in a specific use case.

Example: Struggling to think of a good one here but leaning towards something like a software library. Thoughts?

Open Source (Ad-Supported):
Software companies who develop open source software for free and derive revenue from advertising or lead-gen referrals.

Example: Mozilla

Added an Open Source section. Thanks, @amanoske.

Actually Red Hat makes most of it's money from subscriptions - so it should be under the subscription section, only a very small percentage of Red Hat's money comes from consulting.
This is a common misconception about open source companies.
Also Freemium could be more correctly called open core - extra bits that you pay for often come with a different license and are sold like traditional software with a license + maintenance charge.

Open Source section was a necessity. Thank you.

I could be wrong, but Magento would probably fall under that Open Source (Support) section.

under gaming, Valve does quite well with cosmetic items on Dota2

Excellent list!!!!

One that you're missing Price Comparison... a la www.pricegrabber.com and https://www.priceplow.com and friends

Open Source / Free for some, but not for others

Would Data Geekery / jOOQ (http://www.jooq.org) be a good listing?

Love the list.

Missing:
www.bartersugar.com - barter for inventory, space and services

GitHub itself should definitely be added to this list.

Where would fitbit or jawbone fit into this?

Has anybody made this into a book yet.

Also is WhatsApp a 'paid-app download' - I think it's a free download isn't it? Or at least it should also be in the in-app subscriptions next to New York Times.

Service aaS? really?

More suggestions in this Hacker News thread.

These are really really exhaustive, but not beginner friendly. I'm also very much into figuring out all possible online business models and made a book out of it. For anyone interested in these 22 online business models, there's a free 10-part email course you might want to check out.

any one can tell me sketchdeck.com , conceptdrop.com are what type of business model??