Link listed under related link section.
Inv Edit basically allows you to spawn in items from your inventory.
Well you can pay money for it but you get it free on most websites, the easiest download is on the Minecraft forums.
by going to the minecraft website and clicking on profile, edit character, then download the skin maker
Minecraft Inventory editors are completely free do download as they are player made. A few outside the game you can try are InvEdit and InvGrid. A mod for the game that allows you to edit your inventory in-game is called TooManyItems, which I recommend if you know how to mod your game.
Pressing 'E' will open your inventory.
You can. Just get it from the Minecraft Forum. Run it, then you can make and edit skin files for Minecraft.
You can't really cheat, but there are some mods (specifically, Single Player Commands and Too Many Items) that let you give yourself items. There are also inventory editors that let you edit your inventory and give yourself items.
You don't have an intrevory in minecraft, but we do have an inventory.
Press E
no
press e to access your inventory, then drag your items for the lower bar to your inventory
The best way to do this would be to use Too Many Items In-Game Inventory Editor, on the second page, there is a row or so of snow slabs with different thicknesses.