Hello cosmos,
I've recently decided to start developing a new office suite, supporting ODF and later on OOXML.
Its main features:

• Single application, using tabs for creating and editing simultaneously any type of document.
• Intuitive GUI, with a sidebar containing foldable toolboxes for every action needed.
• Simple and straightforward to use.
• Pure C++ coding, for speed...
• All platforms supported (Linux, Win, and maybe MacOS), through the use of wxWidgets.
• Use of open source libraries and artwork.
  

Here is a first screenshot of the intended GUI. It is simply a husk, since no functions are implemented yet.