From Aptana

All Operating Systems

• Quit Studio
• Delete the .metadata folder inside your workspace folder (See Finding your workspace here).
• (To totally eradicate all traces of Studio in your web application folders inside the workspace) Delete all the .project files in the top level directory of each of your Aptana projects
• Complete the steps for your operating system

The -launcher variable in the Help->About Aptana Studio->Configuration Details window will tell you precisely where Studio is installed.

Warning: If you have a separate installation of Eclipse that uses the same workspace as Aptana Studio, deleting the .project files will remove project metadata also used by Eclipse.

Mac OS X

• Delete /Applications/Aptana Studio

If you are uninstalling Aptana Studio 1.2.x you will also need to remove

• Delete ~/Library/Application Support/Aptana/Aptana Studio

Windows

• Using the Add or Remove Programs applet on Control Panel to uninstall Studio
• If Aptana Studio is not listed in your "Add or Remove Programs", it may be because you chose to install Aptana Studio with a zip. You will have to determine where you installed it (hopefully in your Program Files) and manually delete it.

If you are uninstalling Aptana 1.2.x you will also need to remove:

• Delete the C:\Documents and Settings\<your Windows username>\Application Data\Aptana directory

Linux

(Note: To delete all .project files in your workspace, run rm -r `find . -name .project`)

• Delete the script that sets up the Aptana Studio environment (the Linux install instructions suggest you name it runAptana)
• Uninstall xulrunner
• Delete the Studio installation folder (installation directions recommend that you install Studio in /usr/local/aptana).
• Delete your configuration directory (~/.Aptana)