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The website openDesktop.
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Realtime code sharing for developers.
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Real-time collaborative development.
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Freecode (formerly known as Freshmeat) is one of the legit open source development platforms that will be the key for developers and programmers to have a streamlined process via having enhanced collaboration and coding leverages.
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TuxFamily is a non-profit organization.
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Live share IDEs and coding sessions. See changes in real time.
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Extend Git with real-time collaborative superpowers.
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Collaborate in real time in Atom.
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A directory of open education resources and lots of free educational software.
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Tigris is a platform providing open sources, software, and information resources for professionals and students.
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Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers.
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PMRobot combines Bug Tracking + Client Collaboration + Agile Project Management Software.
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dabblet is an interactive playground for quickly testing snippets of CSS and HTML code.
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OStatic's goal is to increase the adoption of Open Source Software by helping users find viable projects and applications that fulfill specific needs, evaluate them against available alternatives and collaborate with their network of trusted peers.
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Managed Server.
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BerliOS Developer is an all-in-one open source management platform, providing users to find the products that they need in making their workflow to be more agile.
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Collection of Awesome CSS and JS Creations to help out frontend developers and designers.
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Snipplr was designed to solve a simple problem.
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Codehaus is a platform providing open sources, software, and information resources for professionals and students alike and providing them the right and authentic open-source code to streamline their development process.
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"Leaps is a command line utility and golang library for collaboratively editing your local files over HTTP, using operational transforms to ensure zero-collision synchronization across any number of editing clients." - from the github readme.