Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.
Feng Office - Feng Office is a commercial Open Source web based solution aimed to enhance collaboration and productivity
Just Not Sorry - Highlight 'weak' words so you can edit them out
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.
Hemingway - Hemingway App makes your writing bold and clear.
Redmine - Flexible project management web application