Open source alternatives to Slack, Google Drive and Google Docs

Contentus
2021-08-22T08:48:52Z

So I recently started working at a company that uses Slack (free tier), Google Drive and Google Docs. Being a privacy conscious person I decided to do some research to see if we could transition out of at least 1 of these tools.

For Slack I thought about Element. However I have a question: is it possible to create a closed channel (meaning no unauthorized person has access to or can discover the company chat) on Element with only the free tier (it's easier to convince my boss to transition if it doesn't add to the cost structure)?

For Google Drive I don't think there are other free options that offer the 15GB of storage we have. 10GB would probably be enough. But I am also open to paid solutions.
I found out about CryptPad. They offer cloud storage but one has to pay to be at the same level of Google (which is totally understandable). They also have productivity tools integrated with the storage solution which is great.
Maybe there is some cloud storage solution that doesn't have integrated productivity tools and offers more storage. I would like to know.

I'm open to suggestions and thoughts. My functions at the company have little to do with all this, I am just interested in open source and privacy. EDIT: I am not interested in self-hosting.

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