We covered cottage industry appropriate technology in a previous blog post. The aim here is to identify the top 10 products for ease of construction, impact on community and potential profitability. These products obviously go way beyond just creating jobs and making a buck. The products featured here will have a big impact on local communities. Some are saving thousands of lives. Water filters, for example, help prevent disease. Treadal pumps have enabled hundreds of thousands of farmers to greatly increase crop production.