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Plausible Analytics
Simple, open source, lightweight (< 1 KB) and privacy-friendly web analytics alternative to Google Analytics.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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firebase-to-supabase-auth-migrator
Collection of scripts to migrate from Firebase Auth users to Supabase Auth
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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.
As for privacy, the only analytics I'm using is from Plausible.io. I don't want to track people or sell their data and Plausible is a privacy-friendly tool.
frontend - Vue.js
backend + auth - Firebase
Another alternative I'm considering is Supabase
Seriously, though, auth migration can be tricky, but many people have done it. Maybe look at this repo as an example and reach out for help: https://github.com/liaujianjie/firebase-to-supabase-auth-migrator