Merlot offers both a free tool for creating OERs and hosting them.
A free to use tool that allows for OER creation, editing, remixing, and sharing.
Allows users to create a book that's format resembles a wiki (think of Wikipedia pages) and easily allows you to invite collaborators and readers to contribute as well.
An open source ebook editing and creating platform with the option to host your works, and to control usage/access to the texts you create and share.