ARM is pretty much the only alternative. IBM doesn't pimp POWER enough, Alpha was sold to Intel when Compaq taught that the Itanium would outgun it, and something similar happened to MIPS when SGI adopted Itanium too.
The Itanium was surprisingly successful for Intel, not for any particular merit of the design, but rather because it forced Alpha, MIPS, PA-RISC and others out of the market.