The best replacement for scom is sccm.

The best alternatives to scom are rated as following:
★★★★★  sccm
★★★★  nagios
★★★  solarwinds
★★  splunk
★★  vcops
★★  orion
★★  opmanager
★★  zenoss
★  zabbix
★  sce
★  whatsup gold
★  prtg
★  hp operations manager
★  bmc patrol
★  manageengine
  openview
  appdynamics
  tivoli
  hp openview

Your alternative for scom is not listed? Suggest!
Speaking about scom, one probably shouldn't forget about sql 2008 r2.

Other search terms related to scom and their ratings are:
★★★★★ sql 2008 r2
★ scsm
You have in mind a companion for scom and it is not yet here? Propose!



Google Trends

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scom
sccm
nagios