If you got excited after reading the title, I have a bad news for you – Slideshow isn’t going open source (but remains free for personal as well as commercial usage).
Starting today, there are two pages on GitHub regarding Slideshow software available for public:
Slideshow support – https://github.com/milan-fabian/slideshow-support
This page is for creating, discussing and tracking bug reports, feature requests and support questions. To ask a question or suggest a change, create new Issue in this repository (see “Issues” tab on the top of the page).
Slideshow localization – https://github.com/milan-fabian/slideshow-localization
Repository containing translation files for Slideshow. If you want to fix existing translation or add translation for language that isn’t supported yet, feel free to create pull request or create an issue in this repository. The change will be added to the following release of Slideshow.