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I tried the graphing tool.
Free to sign up and use. You need an email.
There is an upgrade version which I assume you have to pay for. So far, IDK what the limitations are on the free version. (Maybe size or number of collaborators?)
You can import / export data from spreadsheets.
To enter data from scratch, you just click/drag/type. The data you enter appears as a connected graph, but you can also look at the data in a table that the application creates automatically from your graph.
You can share/collaborate with others. I haven’t tried this, but if someone wants to create an account and work with me, we can check that out. Hoping someone does, because that is kind of the point.