ansible-openwisp2 VS openmptcprouter

OpenWISP (https://openwisp.org) tries to do this and it's Python and Django based.

Last time I checked it out, it seems like they keep configuration in an intermediate format that is then translated to manufacturer-specific formats, so it should be possible to build a Unifi converter for that.

OpenWISP (might be closest thing I've seen to what you're looking for)

Time to flash openwrt and use openwisp?

For those using OpenWRT looking for a central controller which can be installed on-premise: https://openwisp.org/

I think you are wrong. I have been working on https://openwisp.org for some time and implementing a controller which is robust and can handle many different corner cases and offer good functionality and also ease of use is a challenge and requires several people working full time on it. Even simple functionality it's a lot of work, unless for simple you mean really trivial. If it wasn't hard, there would be many alternatives but as far as I know there aren't many.

For DIY options you can go with something like https://www.openmptcprouter.com/, there are also similar comercial options that I can't think of at the moment.

However, there is actually such a thing as bonding to get additive performance on a single transfer. For that you need your own external server in a datacenter somewhere that serves as your "real" outside connection. To describe it simply, you are basically running multiple VPN tunnels to that outside server over your multiple physical WAN connections, and your server distributes your traffic across the tunnels so that you do actually get nearly full additive performance. Others have mentioned https://www.openmptcprouter.com/ already, which is the best known project I'm aware of that actually successfully does this.

There is a 2 part install, one on the Vps, easy in fact with an auto install script, and the other on local pc desktop with multiple network cards, easy as installing an Os from iso file. Have a look at tutorials here https://github.com/Ysurac/openmptcprouter/wiki/Install

You can trunk / bond all your connections with https://www.openmptcprouter.com/

https://tailscale.com/ its even easier than zerotier and its using wireguard , there is also a fully selfhosted option (but then you need a VPS again) called netmaker https://github.com/gravitl/netmaker another option (also needs a VPS) is to setup a v2ray proxy and give you bascially a fixed IP you can do that with openmptcprouter https://github.com/Ysurac/openmptcprouter .

Another project that looks cool is Open MPTC Router. I have wanted to try this because you are not necessarily tied to a particular bonding service, but it does require you to spin up a virtual Machine in the cloud with a service like AWS or Azure.

There are several multi-path TCP solutions, my chosen one it OpenMPTCPRouter open source firmware that I run on a Ubiquiti Edge Router X ($70), out to a Digital Ocean Droplet ($5/m).