There is now a way to turn a Shiny app into a standalone Electron app (which is a desktop app, used for apps like Slack). To find out more, see this excellent presentation (YouTube) from useR 2018, which contains further links:
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GitHub ColumbusCollaboratory: Photon. RStudio Add-in to build Shiny apps utilizing the Electron framework
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@TravisHinkelman’s blog “Deploying a Shiny app as a desktop application with Electron”