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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.
One option is to use a VPN established as a peer-to-peer overlay network with the vendor. This has the advantage of not needing to run a VPN server, and not needing to open the firewall as the link is established using only outbound traffic on both sides. Have you considered https://enclave.io, https://zerotier.com or https://tailscale.com?
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.