Feng Office - Feng Office is a commercial Open Source web based solution aimed to enhance collaboration and productivity

Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.

LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.

Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.

Redmine - Flexible project management web application

Just Not Sorry - Highlight 'weak' words so you can edit them out