The best replacement for ospf is eigrp.

The best alternatives to ospf are rated as following:
★★★★★  eigrp
★★★★★  rip
★★★  bgp
★★★  is-is
★★★  isis
★★  ripv2
★  ibgp
★  igrp
★  stp
★  ospfv3
★  bgp mpls
★  ospfv2
★  vrrp
★  eigrp comparison
★  mpls
  static routing
  spanning tree
  is is
  rip v2
  rip2
  eigrp which is better
  static routes
  rip version 2

Your alternative for ospf is not listed? Suggest!
Speaking about ospf, one probably shouldn't forget about hsrp.

Other search terms related to ospf and their ratings are:
★★★★★ hsrp
★★★★ bgp
★★★★ mpls
★★★★ frame relay
★★★ vrf
★★★ ipv6
★★ bfd
★★ vrrp
★★ dmvpn
★ gre tunnel
redundant link
quagga
loopback address
You have in mind a companion for ospf and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ospf in all years. Click on graph for more.
ospf
eigrp
rip