I would love to see an open-source operating system that supports Windows applications. Although I understand the size of this project would be enormous. React

I would love to see an open-source operating system that supports Windows applications. Although I understand the size of this project would be enormous. ReactOS is still far behind, although what they have accomplished so far is amazing. Also an open-source virus scanner would be nice (besides ClamAV which if I recall correctly doesn't support real-time scanning). And I would love to see an alternative to Android and iOS take off into the mainstream.