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awesome-tunneling
List of ngrok/Cloudflare Tunnel alternatives and other tunneling software and services. Focus on self-hosting.
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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.
fwiw, ngrok is no longer open source; they have a free tier. Here is a list of open source alternatives - https://github.com/anderspitman/awesome-tunneling.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.