The Core Exiles Data Repository is the bible of Core Exiles. While it does not contain every item available to a player it contains most items for low to mid level players.
Items are broken into categories and clicking each tab will display the items.
Some item details are displayed in the listing screen and a player can click the info button for more info.
The CEDR will allow players to view all details about a item such as power requirements, level locks, skill point investment required and some history and background information on the item.
Some item lists such as the schematics can be very long. A good tip is to let your browser load the list and then use the find function of your web browser to search for known items.