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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.
Nitroshare allows you to send files over WiFi on Windows, Mac, Linux, iPhone, and Android. It's P2P so all your files aren't intercepted by anyone else and they don't require any servers to be up and running, just for you to be on the same network. It's also open source on GitHub. I've used it for a few months and it's great. Link: https://nitroshare.net/
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.