Atlassian Confluence

Confluence helps you develop, manage, locate and work together on content. Give all teams, departments, projects and even employees their own space for developing content, optionally with dedicated admin, security restrictions and customisation possibilities. You can attach Microsoft Office documents and almost all popular file formats to the pages. In Confluence, users can comment on every page and every blog entry. All Confluence content can be searched: Pages, blog, comments, attachments, documents and people. The software's central dashboard helps you stay up to date all the time.