asuswrt-merlin
on SourceForge
RT-AX88U/Beta/RT-AX88U_384.15_beta1.zip
RT-AC86U/Beta/RT-AC86U_384.15_beta1.zip
RT-AC5300/Beta/RT-AC5300_384.15_beta1.zip
RT-AC3100/Beta/RT-AC3100_384.15_beta1.zip
RT-AC88U/Beta/RT-AC88U_384.15_beta1.zip
RT-AC3200/Beta/RT-AC3200_384.13_3.zip
RT-AC87U/Beta/RT-AC87U_384.13_3.zip
RT-AC68U/Beta/RT-AC68U_384.15_beta1.zip