A free app for Android, by CADian Soft..
CADianAnyView is a free app to view and edit a drawing in your mobile device. It can support both 2D and 3D drawings and also has many functions to improve your work efficiency. It can be used by both a designer and a customer and can help them work together more efficiently.
CADianAnyView is an app that can open a file saved on your device and edit it on the spot. You can draw freely on the screen and use the pen tool to write text and make shapes. You can even choose the color and transparency of the drawing. You can use the eraser to remove any mistakes and you can also change the angle of the view.
If you have a design in your head, you can even make a 3D object and view it in your design software.