Not Enough Items

The Not Enough Items mod allows users to search items in the modpack (or just in Vanilla) If you are an OP on the server you can spawn items in by clicking on them or if you are not opped you will find the recipe (If you are an OP press on the item to find the recipe).

Source : http://www.attackofthebteamwiki.com/wiki/Not_Enough_Items