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Get flash to fully experience Pearltrees
http://x-stream.ly/ For most apps using X-Stream.ly , no server-side coding is required. When clients join a channel, they can be brought up to speed on everything they missed, automatically. There is no need to store all that state on your own server. This allows many apps to be hosted as fast, static sites on services like S3. All of your app's live, dynamic content is pushed into the app from X-Stream.ly .

x-stream.ly: real-time real easy

http://frozenmountain.com/websync/ WebSync allows you to push live data to a web browser or any other compatible client without requiring any plugins, security changes, or dedicated servers. Unlike other Comet/Reverse Ajax solutions, WebSync does not require any additional servers, different ports, or fancy configuration. WebSync works directly with IIS (or the development server shipped with Visual Studio), and can therefore be easily added to any ASP.NET project with little more than a couple web.config entries. No need to host additional servers, mess with extended installations or configuration, or figure out what security restrictions are in place - WebSync "just works" . In addition to being made for Microsoft's platform, and being very simple to use and integrate, WebSync has incredible performance.

WebSync Comet Server, HTTP Push/Reverse Ajax Streaming for ASP.NET and IIS - Frozen Mountain

Any content posted from the Middle East, including Yemen, Oman, the UAE, Qatar, Bahrain, Saudi Arabia, Kuwait, Israel, Jordan, Turkey, Cyprus, Lebanon, Syria, Iraq and Iran.

DataSift: Realtime Social Data Mining Platform

http://datasift.net/

PubNub ★ Cloud-Hosted Real-Time Messaging Mobile, Tablet, TV, Web

http://www.pubnub.com/ Hundreds of apps and thousands of developers rely on PubNub for delivering "human-perceptive" real-time experiences that scale to millions of users worldwide. PubNub delivers the infrastructure needed to build amazing MMO games, social apps, business collaborative solutions, and more.
http://kwwika.com/

Kwwika - The real-time web. Delivered.

The Kwwika service ceased operation on 01/06/2011 Unfortunately the decision has been made to cease operation of the Kwwika service as of 01/06/2011. I'm sorry for the short notice and any inconvenience that this may cause. I will be moving to Pusher who offer a fantastic real-time messaging service, similar to Kwwika. It would be great if you would join me there.