Indeed!!
MIPS - $zero
RISC-V - x0
SPARC - %g0
ARM64 - XZR
PowerPC: "r0 occasionally" (with certain instructions like addi, though this might be better considered an edge case of encoding)
Alpha: r31, f31
PowerPC: "r0 occasionally" (with certain instructions like addi, though this might be better considered an edge case of encoding)