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SmoothWAN
An OpenWrt flavor for internet bonding and seamless failover using Speedify with few extras.
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openmptcprouter
OpenMPTCProuter is an open source solution to aggregate multiple internet connections using Multipath TCP (MPTCP) on OpenWrt
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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.
Personally, I pay for Speedify, and I have it set up in my router, which is actually a Raspberry Pi 4, using this great OpenWRT adaptation: https://github.com/TalalMash/SmoothWAN
I think this is exactly what you're asking for, it's basically open-source Speedify using a VPS of your choice: https://www.openmptcprouter.com/