The best replacement for hardware raid is software raid.

The best alternatives to hardware raid are rated as following:
★★★★★  software raid
★★★  software raid linux
★★  windows raid
★★  zfs
★  storage spaces
★  mdadm
★  lvm
★  raidz
★  linux raid
  software
  firmware raid
  onboard raid
  os raid
  fake raid
  intel raid

Your alternative for hardware raid is not listed? Suggest!
Speaking about hardware raid, one probably shouldn't forget about freenas.

Other search terms related to hardware raid and their ratings are:
★★★★★ freenas
★★★★★ zfs
You have in mind a companion for hardware raid and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hardware raid in all years. Click on graph for more.
hardware raid
software raid
software raid linux