Tools for Linux Performance Monitoring

htop
 
http://htop.sourceforge.net/


dstat
 
http://dag.wieers.com/home-made/dstat/


bmon
 
http://freshmeat.net/projects/bmon/


iftop
 
http://www.ex-parrot.com/pdw/iftop/


ifstat
 
http://gael.roualland.free.fr/ifstat/