Chamomile and peppermint are two others that can be used.
Chamomile has antimicrobial properties and could lighten the hair slightly.
Peppermint doesn't do much for the hair, but does give a tingly, invigorating feeling to the scalp
One thing that hasn't been mentioned is that all essential oils could produce allergic reactions in certain individuals. I'm allergic to two of the oils SE mentioned.Always do a spot test on your skin first, or better yet, get a doctor to run a full allergy test.
Also, this is more debatable, but there is some evidence that it's a bad idea to use lavender oil when pregnant, or if you are a prepubescent boy. There's not enough evidence to say for sure, but the oil has been implicated in developing gynaecomastia (man boobs) in boys.
updated by @dias: 07/22/15 10:13:22AM