TerrariViewer

TerrariViewer is a tool that was created for Terraria players who want a bit more freedom when it comes to customizing their characters.

It displays a tabbed,  user-friendly interface that makes it a cinch to edit character name, HP, mana, hair style, armor, accessories, inventory and the Piggy bank. Apart from that, you can also choose custom colors for hair, skin, eyes, shirt, underskin, pants and shoes.

From its tabbed GUI, you add equipment and accessories simply by choosing a slot and them selecting the item from a list. Once you have your option, its icon is shown and you can even set the stack count.

You can also fill up your inventory in the same simple manner with whatever items you want, coins and ammo. Buffs can also be added and you are able to set their duration.

After all the customization work is done, you're free to save the character and then launch Terraria.