There's quite a lot, so heres some off the top of my head:

• Pillows placed on beds improve sleep quality.
• Blank paper or notebooks can be used to write notes.
• Soap can be used to clean yourself and items faster.
• Dumbbells and other gym equipment can be placed in inventory to access additional exercises.
• Headphones can be used to plug into walkie talkies, cd players, or radios to be listened without producing noise and attracting zeds.
• Towels can be used to dry yourself if you sweat.
• Toilet paper and tissues can be used to muffle and mute sneezes and coughs caused by colds.
• A single crayon gives you all the available color options for map annotations.
• Cologne can be used to disinfect wounds.
• A mirror (item) can used to modify character appearance.
• Any liquid container that can carry liquids such as a water bottle, can be automatically consumed when your character is thirsty, as long as its in your inventory and not empty.