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The BotBuilder is an Open source framework (https://github.com/Microsoft/BotBuilder) to connect to Skype, Slack, Text, Office, Twitter and more.

Thanks for that additional information - I didn't realize this was meant to be more open. Slack support is welcome.

"Slack support is welcome"

Correct me if I'm wrong, but isn't slack a closed ecosystem, akin to Skype?

I think he means open as in supporting more than one platform.

I actually think he means "open" as in "not Microsoft" :)