Is there any parts repository available for blender? In autodesk, sketchup there are some specific parts repository to import directly.
Is there this kind of repository for blender?
Blender uses addons (like plugins) to extend its resources and tools. These are found in File>User Preferences. 



Blender comes packaged with Extra Curve objects and Extra Mesh objects addons. But you have to activate them first in the User Prefs panel as shown above.