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n8n
Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.
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Something like n8n might work. You can set up a schedule for tasks & pull data etc . You'd still need an SMTP host to send the mails & login details etc https://n8n.io/
Maybe Moodle? I know it's got a lot of features for actually creating and hosting online classes. It does include calendar and notification features. There are many Docker builds out there.
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