I would like to analyse UAV 2D images to create 3D point cloud, DES, and orthomosaic image.
Can you suggest or mention some open source software or python packages?
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Have a look at OpenDroneMap.
Drone Mapping Software
Generate maps, point clouds, 3D models and DEMs from drone, balloon or kite images.
Open Source Toolkit for Processing Aerial Imagery
ODM turns simple point-and-shoot camera images into two and three dimensional geographic data that can be used in combination with other geographic datasets.
In a nutshell, it’s a program that takes images as input and produces a variety of georeferenced assets as output, such as maps and 3D models.