[MisterTea]

Quick glance of their page only mentions Turris OS being built on open source. If I can't blow away Turris OS and install whatever, then it's not open and uninteresting.

[eqvinox]

You can install whatever you want on Turris devices. And you get schematics and gerber files.

https://project.turris.cz/en/hardware-documentation.html

[mieses]

Vanilla OpenWRT runs Omnia (Marvell Armada). OpenWRT support for IPQ9574 is WIP. Omnia NG is IPQ9574.

https://openwrt.org/toh/turris/turris_omnia

[cyberax]

Turris has its own OpenWRT warapper, but you can just wipe it and install the stock OpenWRT.

[frantathefranta]

People run NixOS on their Omnias, that's enough for me.

https://gitlab.com/Cynerd/nixturris/