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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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MarginaliaSearch
Internet search engine for text-oriented websites. Indexing the small, old and weird web.
I'd suggest Lemmy which is a federated version of Reddit (similar to Mastodon:Twitter). I use an app called Jerboa for Lemmy, it is a bit buggy, the user experience is still lacking, and finding a server to create your account with isn't the easiest. But it's a start...
With open source those who were motivated could probably adjust the user-agent in line with the API rules and be OK for personal use through the free-tier API access.
Both Beehaw and Lemmy.ml have been slammed recently, and it's been extremely active. You can use the Android app Jerboa to navigate it on mobile; I think you'll find a very familiar-feeling interface. ;)
There are a few search engines I've found geared towards finding interesting small sites. Less focus on curation but you can find some interesting stuff. I've been enjoying the "random" button on https://search.marginalia.nu/ a lot.