@M10 mentioned TsingMa based switches (I think in jest)
I stumbled upon the SKS8300-6Q2C after hearing about it on Reddit. 6xQSFP+ + 6xQSFP28 powered by a CTC7132 for 750 EUR / 850 USD.
They share some code on Github.
Pim van Pelt wrote about different switches build on that SoC.