Google Docs allows you to create documents, spreadsheets, presentations, and more. You can upload existing files (including DOC, XLS, ODT, ODS, RTF, CSV, PPT and more). Google Docs also allows for easy collaboration with others: files may be shared, and various permissions may be granted by the document owner. Their Help Center has Getting Started guides, tutorials, and more.
Create free wikis. Wikis are a great way to share information, and are also useful as a "brainstorming" tool. Wikis are web sites that can be shared and edited by a group. Little to no knowledge of creating web pages, html, etc., is needed.
A public domain suite of interoperable software tools. It provides for easy data entry form and database construction, a customized data entry experience, and data analyses with epidemiologic statistics, maps, and graphs for public health professionals who may lack an information technology background. Used for outbreak investigations; for developing small to mid-sized disease surveillance systems; as analysis, visualization, and reporting components of larger systems; and more.