JMeter – User’s Manual
Apache JMeter is a 100% pure Java desktop application designed to load test client/server software (such as a web application ). It may be used to test performance both on static and dynamic resources such as static files, Java Servlets, CGI scripts, Java objects, databases , FTP servers , and more. JMeter can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types.
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EclEmma – Java Code Coverage for Eclipse
EclEmma is a free Java code coverage tool for Eclipse, available under the Eclipse Public License. Internally it is based on the great EMMA Java code coverage tool, trying to adopt EMMA's philosophy for the Eclipse workbench.
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twittermap.de – Wer Twittert wo?
(mit Verbindungslinien. Wow.)
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Why I Love Twitter – O’Reilly Radar
In many ways, Twitter is a re-incarnation of the old Unix philosophy of simple, cooperating tools. The essence of Twitter is its constraints, the things it doesn't do, and the way that its core services aren't bound to a particular interface.

It strikes me that many of the programs that become enduring platforms have these same characteristics. Few people use the old TCP/IP-based applications like telnet and ftp any more, but TCP/IP itself is ubiquitous. No one uses the mail program any more, but all of us still use email. No one uses Tim Berners-Lee's original web server and browser any more. Both were superseded by independent programs that used his core innovations: http and html.
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