For a more modern option with even more pins, there's SMARC. https://en.wikipedia.org/wiki/Smart_Mobility_Architecture https://en.wikipedia.org/wiki/Smart_Mo

For a more modern option with even more pins, there's SMARC. https://en.wikipedia.org/wiki/Smart_Mobility_Architecture https://en.wikipedia.org/wiki/Smart_Mobility_Architecture This isn't just a form factor, there's also some standardisation around what's routed where. It still gives you some leeway too.