Free software to create presentations (slides with audio) that are suitable as Open Educational Resources (OER). Layout and style of presentations are separated from content to simplify collaboration across organizational boundaries. Slides’ content is written down in simple text files, which enables comparisons of adapted or enhanced versions (with diff-like functionality).
Sorry for being very late. Yes, the software itself should be classified as tool. Is there functionality for such re-classification? I would then create a service based on this service. (I create a similar comment minutes ago, but do not see it here...)