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Slack Overflow - A programmer's best friend, now in Slack.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Mercurial SCM - Mercurial is a free, distributed source control management tool.
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.