The best replacement for vcs is ics.

The best alternatives to vcs are rated as following:
★★★★★  ics
★★★  dvcs
★★★  scm
★★★  modelsim
★★  sun cluster
★★  angel investors
★★  rac
★  ncsim
★  lcs
★  ibbotson
★  rhcs
★  gta lcs
★  redhat cluster
★  incisive
★  hmrc
  lcs gta
  gta vc
  hacmp
  ncverilog
  nc verilog

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

Other search terms related to vcs and their ratings are:
★★★★★ zfs
★★★★ solaris zones
★★★★ cucm
You have in mind a companion for vcs and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of vcs in all years. Click on graph for more.
vcs
ics
dvcs