The designing softwares vary depending on the part to be designed. Some of the good designing softwares I am listing below:
Autocadd
Rhinoceros
Catia
Solidworks
Ansys
3Ds max
Sketchbook designer
Lightwave
Blender
Adobe photoshop
Hope you find it helpful
let me know in the comment box if you are having any further doubts
thanks
Good Luck!
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