The Messerschmitt Me 329 was a design project for a heavy fighter and ground-attack aircraft, developed towards the end of World War II. It was a competitor and possible successor to the Me 410.
https://youtu.be/Mk7U8juprtk
Like the Me 265, the Me 329 used an advanced flying wing design. Other advanced features included the pilot and navigator sitting side by side in a broad bubble canopy, and a remote-controlled rear gun in the tail. In spite of the futuristic design, the improvement in performance over the Me 410 was marginal.
Development received a low priority, and while a full-scale glider was tested at Rechlin in the winter of 1944/5, work on the project was cancelled shortly after.
Sources: Wikipedia; YouTube; Fan d’Avion; Armed Conflicts