Bespoken has created a bot named Silent Echo, which allows users to interact with Alexa over Slack.
Silent Echo converts text to audio, sends the audio to Alexa, and returns the audio output from Alexa to the user as text.
Users can activate Silent Echo by adding it as a virtual Alexa device on their Amazon account.
Additionally, Slack users can install the bot and interact with it via instant message or by mentioning the bot in a public channel.
Silent Echo supports Alexa Smart Home skills and custom skills, and is available to install from the official website.