Openmeetings allows people to conduct virtual meetings with audio/video chat, screen sharing, document sharing on a whiteboard, and recording meetings. Disqus helps people manage shared knowledge on the web by allowing them to see articles and comments they've shared, access statistics, and comment on others' posts. Slideshare allows users to share, view, download, and reuse presentations and documents on various topics. Dropbox allows users to store and share large files like videos and photos that are too big to email.