From the site:
Koobug is a site for writers to show and sell their work. We feature links to buying elsewhere, and will soon be releasing our own book reader apps and software, giving authors a much better cut of the price… Koobug was created by writers and authors – both traditionally and self-published. We want our site to encourage and let people discover high quality writing. We hope this site inspires you to start or continue writing, and that it helps you to achieve great things. Write to be read.