OpenWrt
5.0 ex V stellae (secundum recensionem I)
OpenWrt (ex iter wireless apertum) propositum est apertum fonticulum ad systemata operativa innixa Linux, imprimis adhibita in machinis immersis ad iter retis mercaturae. Praecipuae partes sunt Linux, util-linux, musl, et BusyBox. Omnes partes optimized sunt parvae satis aptae in repositione limitata et memoria in promptu domus iter itineris.
Important difference: there are OpenWrt products that are for sale, like the “OpenWrt One MediaTek MT7981B” for 89$ on Aliexpress (https://www.aliexpress.com/item/1005007795779282.html) and there’s also merch for example: https://openwrt.org/merchandise – these things cost money and are for sure not trade-free. However, the software itself and the documentation is trade-free – made by the community.