ipcop  1.4.21
About: IPCop is a Linux firewall distribution (a secure Linux distribution managed through a web-interface). Hint: The stable version 2.0.x is released (but no source tarball available).
  Fossies Dox: ipcop-1.4.21-sources.tgz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

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ipcop Documentation