Some of them are (for WinReducer 8.1) :
- "Remove - Accessories - Input Method Editor"
- "Remove - Accessories - Natural Languages"
- "Remove - Accessories - Tablet PC" (All)
- "Remove - Accessories -Windows Recovery Environment"
- "Remove - Multimedia - Mobile PC" (All)
- "Remove - Multimedia - Windows Optical Character Recognition (OCR)"
- "Remove - Themes" (All)
And using "Optimizations - ISO - Windows - Delete Unneeded Editions" will reduce your ISO size by much !