5. Raspberry PI

Raspberry pi are single board computers developed with the intention of helping school children learn basic computer science. It runs on Linux OS and costs less than $40.

Why it works:

It is one of the cheapest computers available in the market. Although it aims at school children it can be useful to several businesses such as commercial companies, hospitals, museums which are looking to integrate the Raspberry Pi’s low-cost computing systems into their own everyday services.