@Evans, its actually an very interesting journey, i.e the code. 100% of the code that is in use today was developed by propreitary coders who got paid to write the programs for computer systems. The computer languages too, partly. If you look at all layers of the the OSi model, there is none that has been done by non-proprietary. In the context of Kenya, let us go by the layers then, all local code developers:

 

Application Layer : Zero

Network Layer : Zero

Physical Layer : Zero

 

The evidence that you seek is right in front on your computer.