LeechCraft – open-source modular internet-client
github.com
github.com
The closest is this: we believe tight integration between different (and, perhaps, unrelated at first glance) applications may yield synergetic effect and improve the quality and usability of every single application. This project is largely an experiment at what could be the outcome of this vision.
...followed by a suggestion that they'd like to develop a whole desktop environment? It seems good but also like reinventing the wheel. Some clarity about what problems you're trying to solve and why I should prefer it over browser X would go a long way.