GIMP - How to get retina fonts

1. Right-click the gimp.app and choose “Show Package Content”.
2. Edit the file info.plist
3. Just above:

    </dict>
    </plist>

Place this:

    <key>NSHighResolutionCapable</key>
    <true/>

4. Now in order for the OSX to update the change, make a copy of the gimp.app, remove the old and rename.
5. GIMP fonts would not be in retina resolution. However the icons would still be blurry and need a different fix.

Source: jayway.com