You can find a wealth of government APIs at the Data.gov developer page.
As far as real-time nature of the data feeds, the APIs vary in their update frequency. For example, flight status from the FAA updates every 10 - 15 minutes:
Energy: Real-time data portals and dashboards (community wiki)
Hamburg - Feed-in from wind and solar energy into the Hamburg electricity grid
U.S. Electric System Operating Data (see below)
Switzerland - Swissgrid wide area monitoring
Sweden (and neigbhors) - The Control Room
Denmark Energinet (requires ...
A number of municipalities have implemented the Open311 protocol, which allows near-realtime access to municipal service requests.
A list of known installations: http://wiki.open311.org/GeoReport_v2/Servers
I've recently started using Exversion to find open data. They're effectively a search engine for it, and they have a fairly robust API that lets you play around with whatever you're looking for.
As far as real time data, that's tough, I know NOAA publishes this, the FAA, voting data is live during election night, and there are a few others, like the ...
This is huge and can be applied to anything.
Imagine trying to learn how to play poker. You can only play one hand every hour. How long will it take you to learn how to play poker?
"Not too out of date for my use case"
If the company is smart and whose goal is to make a profit, they will change their "use case" or even completely revamp the ...
The FAA does not seem to provide a stream of ADB-S data, but does provide a stream of about airplane location and disposition called Aircraft Situation Display to Industry. Getting access to this stream is not completely straightforward, but you can start with the FAA's page on the program.
While the Google Finance API is officially no longer available, it's still active in returning requests in XML.
// Dow Jones
You will need to consult a programming site like StackOverflow if you have a programming related question.
It takes a while before an API evolves a community and demand for real-time. Some APIs and their topic immediately demand the need for real-time. Twitter, Chat, etc.
I'm more seeing API driven real-time platform evolve that you can use as layer on top of existing APis to get the real-time features you need.
I'm tracking these providers like Pusher and ...
For the Netherlands someone built this map showing all passenger trains in currently in operation: http://spoorkaart.mwnn.nl/
This map is based on the data from this website: http://openov.nl/ (in Dutch, scroll all the way down for the data sets)
From Antony Joseph's answer: I believe this might be exactly what you're looking for: http://tracker....
The exact data you are looking for is kept private as it is a competitive advantage. You have two options on getting the resolution of data you would like:
Go work for the business you would like to investigate. Freight companies are secretive about their fleet management. The first reason is to avoid having their competitors get involved and a slight fear ...
No registry that I am aware of, but some government sites do post all of the webcams within their agency/department/etc., like NPS Air Quality Web Cameras.
I keep a lists of some webcams, here are the ones that have animals.
EarthCam Live Webcam Network has over 500 Search Results for "Animals and Zoos" as well as an Animal Cams section.
Eagle Cam @ ...
ProgrammableWeb(.com) is a great resource about APIs and includes an API directory. A direct link for searching APIs in their catalog that mention websocket is http://www.programmableweb.com/category/all/apis?keyword=websocket . There is also a "real time API" category at http://www.programmableweb.com/category/real-time/api. Some may qualify as "open data".
You can get wind speed & direction from METAR files, which every open airport should be publishing.
I don't know if forecasts are as standardized. I'm used to looking at NOAA's National Weather Service, but there might be better services for non-U.S. locations.
There is a startup that generates stock market signals from real-time social network data
There is a logistics consultant who visualizes lots of inventory data in real time (link leads to a German promo video).
Here is someone who predicts visitors to South Tyrolean using amazon sales rankings of travel literature (ok, maybe this project may ...
The City of Oakland tacitly agreed to make the shotspotter data open, and the firm representative was eager to do so, but they've not followed up by doing so.
They did release it in bulk in Washington however, not real time.
The Global Disaster Alert and Coordination System should address the alert part.
GDACS is a cooperation framework between the United Nations, the
European Commission and disaster managers worldwide to improve alerts,
information exchange and coordination in the first phase after major
As for the coordination of relief etc, ...
Although the FAA does not redistribute ADS-B data, FlightAware (the largest aggregator and provider of this data) does offer worldwide ADS-B data feeds in a variety of formats: https://flightaware.com/commercial/data/adsb/
Regarding the request from philshem in the comments to the question, I will post my comment details as an answer.
Disclosure: I am the author of the mentioned website.
As a suggestion, as I feel it fits the question and this was migrated from softwarerecs: Currently, I am getting emergency location data up and running and have recently added wildfires and ...
I would love to know what real value generating business use-cases there are, that involve people, which require real-time data?
I'm going to focus on savings, such as lives and property:
In the case of weather reports, knowing as soon as possible when something is forming or approaching that might affect your business can give you more time to properly ...
Plenario.io seems to be something along what you want...but I may be mistaken here
NASA seems like they will/do have a solution for this: they publish vast quantities of data, that sound very similar to what yours sound like. It may be worth your while to check out:
NASA Open Source Software
NASA's GitHub Profile
Here's a new-ish open source resource for live Swiss trains.
This map is an animation based on the official timetables of the Swiss Federal Railways(SBB) network.
Real time information available from the GTFS-RT feed by opentransportdata.swiss
I managed to find the following datasets which are close to the description above:
UCI Air Quality Dataset, the amount of each gas can be considered a dimension:
UCI EEG Eye State Dataset:
US dollar exchange rate compared to other currencies, each one ...
After looking through a few NASA repositories, I stumbled upon the EUMETSAT Website.
This site is a source for near-real-time climate and environmental images from orbit. They offer a WMS service as well as host images of different variables, including dust. Due to the nature of satellite images, having a true real-time source is not very reliable as ...
You could use torrents to collect the IP addresses of peers, although the coding is a bit tricky because of the protocol. I was looking into it as a hobby project, to use Python libraries. See here for more details.
For fun, Netflix Uses Pirate Sites to Determine What Shows to Buy
I don't know if it meets the criteria for "open data", but you can search Shodan for public IP addresses of an assortment of streaming data, like webcams (for videos) media servers (for audio and video).