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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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rethink-app
DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
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serverless-dns
The RethinkDNS resolver that deploys to Cloudflare Workers, Deno Deploy, Fastly, and Fly.io
What NextDNS offers versus AdGuard is more flexibility, such as choosing which adblock lists to subscribe to (including AdGuard's) and customizing which sites to block or allow through.
Rethink, the app (github), isn't similar to NextDNS or any DNS service. It is a user-space firewall, with some nifty IP-based, app-based, and DNS-based rules.
Rethink, the resolver (github), is similar to NextDNS (to an extent), but open source.
DNS66 is on life-support now, even though it works great. Their lead developer, Julian, recommends using Private DNS instead: https://github.com/julian-klode/dns66/discussions/480
Yes, DDG indeed build on top of NetGuard (ref), just like TrackerControl does. So, you're right in one sense.