iStat Menus is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is hwinfo, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to iStat Menus and three of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to iStat Menus are Opsview Atom and remote linux monitor.
The Remote Linux Monitor's graphical user interface is similar to and inspired by Gnome's System Monitor. All connections are made using a secure shell and there is no agent software to install on the remote server.