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Wireguard is the latest VPN protocol. Check out the Wikipedia page (https://en.wikipedia.org/wiki/WireGuard) or it's homepage (https://www.wireguard.com/). Not all VPN providers support it yet (notably Proton VPN), but it is generally faster and more secure than OpenVPN.
It was made by Jason A. Donenfeld.
It does use electron. The source code is available on github.
https://github.com/mullvad/mullvadvpn-app
For what its worth I have used the open source Tinc VPN [1] for mesh multihop routing for ages. It is nowhere near as fast as Wireguard but I could envision Tinc incorporating support for Wireguard if the author were so inclined. Like you mentioned Tinc does not mesh with other VPN's AFAIK.
[1] - https://tinc-vpn.org/