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The little smart home platform that could
(www.theverge.com)
This is a most excellent place for technology news and articles.
If you don’t want to deal with remote access hosting (which can be pretty involved), their cloud service Nabu Casa is $5 and this is exactly the functionality it provides - they don’t host your instance (you still need somewhere to run it locally, like a Pi or one of their devices) but it tunnels your instance out to their managed hosting and you can access it from any Internet connection.