In Xcode 4.3, where do I put the additional tools?
Find Xcode.app and open it by 'Show package content'
Drag and drop new development tool from downloaded .dmg to /Applications inside Xcode
Add yourself to 'Sharing &amp; Permissions' of /Resources with rights to read/write
Repeat step 3 for file

 /Resources/IDEHelperApps.plist

Open file IDEHelperApps.plist in TextEdit.app
Add string with name of added tool to first array. For example:

&lt;string&gt;Contents/Applications/PackageMaker.app&lt;/string&gt;

Save .plist and restart Xcode.