You can find information abut weather underground keys here:
https://www.wunderground.com/weather/api/d/pricing.html
Developer keys are free but are limited in the number of free data requests. Your customers would need to obtain there own keys or you could purchase a key that you could provide to them.
As far as changing the logo and product name goes, that could get pretty complicated due to the fact that the file names, logo, and faveicon images are all SIP based. You will need to be familiar with linux, Python, and javascript programming to make all the changes and to be able to provide support to your customers.
https://www.wunderground.com/weather/api/d/pricing.html
Developer keys are free but are limited in the number of free data requests. Your customers would need to obtain there own keys or you could purchase a key that you could provide to them.
As far as changing the logo and product name goes, that could get pretty complicated due to the fact that the file names, logo, and faveicon images are all SIP based. You will need to be familiar with linux, Python, and javascript programming to make all the changes and to be able to provide support to your customers.