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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.
Another VPN option is https://github.com/theonemule/simple-openvpn-server - It's open source, all you need is a VPS then run the install script. Once it's finished, you can create clients and download the openvpn config file for them from the web interface.
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.