Altera equivalent of the Xilinx Zynq UltraScale+ MPSoC
Altera don't seem to have a nice easy to find selection table, but Stratix 10 seems to be their current high-end part with an ARM-v8 core. Hard to know if its a good fit for your application without any more detail in your question. They don't appear to have their own development board (but maybe I missed something).