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A Simple Bug and Issue Tracker - Sifter
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Flowdock: Group chat for teams. Integrates with GitHub, Jira, Trello.
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GitHub Professional Services | From idea to implementation, our experts are ready to help your team get wherever you want to go. Start a conversation with us about how we can bring your goals to life.
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RubyDoc.info: Documenting RubyGems, Stdlib, and GitHub Projects
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HuBoard - GitHub issues made awesome.
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GitHub Pages | Websites for you and your projects, hosted directly from your GitHub repository. Just edit, push, and your changes are live.
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Developer-first Project Management for Teams on GitHub | Waffle.io