Show Me What You Got
A simple mod which allows displaying your items to other users in chat.
While in your inventory, hold ctrl and then press your chat key while hovering over an item to share it. (so Ctrl+T by default).
Your chat window will open with the linked item inside. Feel free to write a message before or after the item (or both) before sending!
Client or server?
The mod should be installed on the client and the server in order to function properly. Clients without the mod can still see items shared by others with the mod in chat, but can't share items themselves and also won't see the shared item's texture in the tooltip.