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signoz
SigNoz is an open-source observability platform native to OpenTelemetry with logs, traces and metrics in a single application. An open-source alternative to DataDog, NewRelic, etc. 🔥 🖥. 👉 Open source Application Performance Monitoring (APM) & Observability tool
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self-hosted
Sentry, feature-complete and packaged up for low-volume deployments and proofs-of-concept
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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.
Using user's private with no opt-out option is unethical.
If anyone is looking self-hosted for alternatives then they should try SigNoz: https://github.com/SigNoz/signoz
This is the point where I will point out that you can self-host Sentry free of charge :) https://develop.sentry.dev/self-hosted/