Pandora FMS is a performance & availability monitoring system, ready for big environments. It uses agents for local monitoring and can do several kinds of remote network monitoring. Agents works on Linux, Windows, AIX, HP-UX, Solaris and BSD systems.
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Dstat is a versatile replacement for vmstat, iostat, netstat, nfsstat and ifstat. Dstat overcomes some of their limitations and adds some extra features, more counters and flexibility. Dstat is handy for monitoring systems during performance tuning tests, benchmarks or troubleshooting.
Traffic monitor applet for GNOME.Netspeed is an applet that shows how much traffic occurs on a specified network device (ethernet card, wireless LAN card, or dial-up).
mytop is a console-based (non-gui) tool for monitoring the threads and overall performance of a MySQL 3.22.x, 3.23.x, and 4.x server. It runs on most Unix systems (including Mac OS X) which have Perl, DBI, and Term::ReadKey installed. And with Term::ANSIColor installed you even get color. If you install Time::HiRes, you'll get good real-time queries/second stats.