The Doraemon Gadgets can be seen in Doraemon Tentomusi Comics edition volume 11
Here is a list of Doraemon's Gadgets:
Time machine allows people to travel through time. It is in the drawer of Nobita's desk.
A compact device that allows the user to fly using a propeller.
3. Doko Demo Doa . (aka Anywhere Door)
The user has only to think where they want to go and the door will lead to that place after opening the door. The place can also be seen by looking in the open door.
4. 4D Pocket.
Doraemon has 2 pockets like these. One is always put on Doraemon's belly and they can hold an infinite amount of items. Doraemon uses these to keep all his gadgets. The other is kept somewhere near Doraemon's bed. The spare pocket can be used to take the objects from the one Doraemon usually uses.