The best replacement for ipcop is smoothwall.

The best alternatives to ipcop are rated as following:
★★★★★  smoothwall
★★★  pfsense
★★  untangle
★★  ipfire
★★  endian
★  monowall
★  zentyal
  astaro
  zeroshell
  clearos

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

Other search terms related to ipcop and their ratings are:
★★★★★ copfilter
★★★★ squidguard
★ ntop
You have in mind a companion for ipcop and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ipcop in all years. Click on graph for more.
ipcop
smoothwall
pfsense