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As an alternative, here's my list of cheap FPGA development boards: https://joelw.id.au/FPGA/CheapFPGADevelopmentBoards . It covers a bunch of other vendors.

That's a nice guide!

For the open source section: SymbiFlow is now f4pga. https://f4pga.org/

Aside from that. It intentionally does not include any SoM/Carrier card combo even though it seems like everyone is going to that.