Being a user of ispcp and later i-mscp, I found quite interesting the availability of having a CLI (command line interface) to manage your domains from the command line, so the configuration can be automated. With the intention to have more contributors to the code, I'll store it here.
NOTE: This is not official neither from i-mscp nor ispcp, keep that in mind while using it, although the support will be done from the official forums.
Information regarding this tools (for i-mscp): Forum thread with info about the releases -> forum.i-mscp.net
ispcp (the project doesn't seem to be active anymore) only related to old installs.
Information regarding this tools (for ispcp): Howto with usage details -> ispcp-control.net
Released code and discussion/comments can be found here to: Forum thread with info about the releases -> http://isp-control.net/forum/thread-4255-post-85312.html#pid85312