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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.
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tunsocks
User-level IP forwarding, SOCKS proxy, and HTTP proxy for VPNs that provide tun-like interface
This sounds very similar to my slirpnetstack, which is using gvisor netstack to do, which I call translating L3 (packets) into L7 (userspace syscalls like connect()):
https://github.com/majek/slirpnetstack/
This is awesome! In the post you mention "For a couple hundred lines of code (not counting the entire user-mode Linux you’ll be pulling in from gVisor, HEY! Dependencies! What are you gonna do!) ..."
I'll note that while all of gVisor's user-mode Linux is in the same Go module, we've actually gone to decent lengths to keep the network stack logically separate from the rest of the user-mode Linux code.
So while go.sum might look a bit frightening, Brad's depaware shows that the extra code you pull in to binaries by using netstack is actually quite minimal: https://github.com/tailscale/tailscale/commit/5aa5db89d6a9a6....
tunsocks[0] might be of interest to you. It's very similar to the software mentioned by OP except in C. It uses the lwIP usermode tcp/ip stack. It doesn't itself have any VPN or tunneling support, but instead relies on raw packets being passed into and out of a pipe. It can then provide access to that network via various proxies, port forwards, and even raw packets via NAT (very useful for VMs).
[0]: https://github.com/russdill/tunsocks