I am Daniel Peña Vázquez, and BlackDevelopers is the brand of my apps. I mainly make public apps for fun, but nowadays I am also working in some important private projects. If you need an expert developer, you can contact me by email.
Just enter this keyword in the search tool of your store:
Please note that almost all my free apps are free because they include advertisement and that gives enough income for me. However you will always find the option to buy NoAds versions if you dislike to see advertisement.
I should also give credits to 2 persons who helped in development of many apps here: my brother Miguel Ángel Peña Vázquez and Miguel Ángel Romero de los Llanos.