Can i get free softwares for CAD available on the internet?
If you are paying for free softwares, then you are doing something wrong.
This site claims to have 16,000 freewares: http://www.freewarefiles.com/
I guess you'd still need an Internet connection, to continue the free theme. Maybe a local library or coffee shop allows free access to the Internet?
There are not many "free" software available for CAD.
The FREE software that I am aware for CAD is FreeCAD
A little bit of Python programming knowledge will be helpful here.
There are other free open-source designing software but not optimal for Solid Modelling such as Blender or MeshLab or MeshMixer.
If you a student you can use Autodesk Fusion 360 for 3 years or as a non-commericial organization for 1 year for free.
If you part of a university, you can ask your respective department to ask for Student Licence of SolidWorks or SolidEdge or CATIA. You should be able to get it.
As a alternative, you can use services like OnShape for cloud-based online modelling.
Hope that helps. ;)