As a start, JEI is know and the difference between JEI and NEI is that JEI is a stripped-down version of NEI that lacks many of the game's secondary features, as well as mod compatibility and extensions. However, because NEI does not currently support 1.8.9, JEI is your only option if you wish to play the most recent version. Not Enough Items is the perfect remedy to the agony of alt-tabbing to a wiki while playing Minecraft (or NEI). It uses a nice interface on Minecraft's inventory screen to find up the recipe for any item from any loaded Minecraft mod. Not Enough Goods (NEI) is a Tekkit mod that lists all of the items in the game, along with their recipes, and allows you to spawn them in.

Basic Controls:

Inventory:
(Minecraft Options -> Controls)
Show Recipes: Hover over item + R
Show Uses: Hover over item + U
Toggle Item List Overlay: Control + O

Item List:
Show Recipes Click Item or type R
Show Uses : Right-Click Item or type U
Next/Previous page: Scroll Wheel

Open Config Menu: Click Wrench at bottom-right
Toggle Cheat mode: Control-Click Wrench at bottom-right

Search:
Select Search Bar: Click or Control + F
Clear Search: Right Click
Previous Search: Up Arrow
Search by Mod Name: Type @ in front of a word (@thaum)
Multiple terms work together (wand @thaum)

Exclude search terms: Type - in front of a word (@thaum -wand)

Search terms that have spaces in them: Type "" around the words ("two words")

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Not Enough Items Mod