Spawn any item (v.1.2 or lower only)
If you name your character item values surrounded by brackets. EX:  when game references your name, it will spawn items instead. In this example there are 3 items. You don’t always get all 3, but sometimes you do. You’ll always get the first one. You can also name an animal while buying it for a one time spawn. Then you can rename the animal after. If you don’t want to have a weird character name you’re stuck with, then this can be pretty nice.
Multiplayer chat (Stardew Valley Cheats)
To use the chat function, use the right stick to move the cursor to the lower left corner, then press X. This will bring up chat. The host player can use this to pause the game for everyone by typing “/pause”. To resume, type “/resume”.