My brother has an ibook with a 10gb HD, and only had about 500mb free. He would like to know if he can delete the 200mb+ folder titled "Developer Tools." I dont even know what those are. Theyre located in Finder - Applications - Installers - Developer Tools. I could also use the free disk space myself, is there any reason to keep them? I dont know what they are, i've never used them, dont know applescript, whatnot....basically: Are they important to keep?