Not Enough Items Mod is a mod that adds recipes and other unique features into your game, and if you choose to do so, lets you use pre-loaded items in Cheat mode. With the ability to lock yourself into any mode you choose, you can prevent yourself from using cheats, or use blocks as a test build instead of always switching to creative mode. If you love to play with a lot of mods simultaneously, this mod can also solve any ID conflicts with its special ID Dump feature.
This mode is the reason this mod is used so often. With tons of recipes at your fingertips, it allows you to easily search the recipes by name or ID. You can also search for items in the same way just to get a look at them. To keep yourself from cheating, you can just lock yourself into this mode, and not be able to actually load anything.
This mode adds two more features to the recipe mode function, allowing you to still search for recipes and items by name or ID. The additional features include Magnet mode, allowing drops to come directly to you (like a magnet). Delete mode gives you the ability to delete many options.
Although it sounds like a bad thing to do, Cheat Mode in Not Enough Items can actually be pretty helpful, without actually cheating. If creative mode gives you problems, or you just hate to switch between modes all the time, then you might want to give this a try to test out builds or items. Cheat mode basically allows you the ability to cheat the game by giving you unlimited blocks and items, change the time, the weather, and save inventories. You can also instantly switch into creative mode, or heal yourself to full health in survival.