Also known as the Gotha 229, this was a proposal for a multi-purpuse aircraft in flying wing design submitted by the Horten brothers. While the layout was typical for the Hortens, it was obviously highly unusual as compared to contemporary aircraft - nonetheless, air marshal G√∂ring was a fan of the concept, and it didn't hurt either that it was to be composed mainly of tubular steel and plywood, the late war resource situation in mind. When the war came to an end, only a partially constructed prototype had come to pass, but given a little more time, the IXb's chances for series production wouldn't have been bad at all.
This concept for a flying wing fighter by the Horten brothers started it's life with the designation Horten Ho X as early as 1943. By the time the war ended, a prototype had performed a total of about twenty test flights totalling some ten hours. Nonetheless, the groundbreaking design was probably still years away from series production.
The EF 112 was a 1942 proposal for a single seat super-fast ground attack bomber. Featuring a piston layout similar to the one later realized on the Dornier 335, it didn't garner any interest from the RLM and thus was eventually shelved by Junkers.
This concept for a light, cheap fighter aircraft powered by a pulsejet hadn't progressed beyond mockup stage when the war came to an end. The project continued for a while under Sovied direction, and eventually a prototype actually flew - until the german test pilot was killed in one of the first flights.
Very late war concept for a single seat jetfighter. Although advanced, the design showed some serious flaws, so it's somewhat surprising (and possibly owed to the fact that Junkers very optimistically scheduled series production to mid-1945) that it was awarded a development contract. The advancing Soviet armies stopped the project soon after.
Very late war revolutionary concept for a rocket propelled fighter in delta design. A prototype without propulsion was constructed by students from German universities, but before it's completion it was captured by US forces and shipped to the USA. In 1948, the Consolidated Vultee Aircraft Corporation constructed an aircraft largely based on the P.13a - the Convair XF-92.
Initially proposed as a fast bomber as early as 1942, the P.11 was later revived as a multi-purpose aircraft under the designation 'Delta IV'. When the project was ready for prototyping in early 1944, a long back and forth with Henschel, who were supposed to produce the prototype, ensued, and work on the design only proceeded in early 1945, when Lippisch began construction work himself in Vienna. The end of the war halted the projects only a few months later, and what little had actually been completed fell into the hand of the Americans.
The Diana was a very late war concept for a fighter that could be produced as quickly and cheaply as possible with as many existing parts as possible. A scale model was produced in short order, and shortly thereafter Austria-based Wiener-Neustadt Flugzeugwerke were order to commence series production as soon as possible. However, the arrival of the Americans brought an end to the project merely days after.
When the Americans reviewed the plans for this design of a specialized night fighter variant of the Me 262 in mid 1945, they were marked as "Ready for takeoff" - however, no maiden flight ever took place.
The 328B was the design for a cheap, high performance fighter (that could also be used as a light and fast ground-attack bomber) to be powered by pulse-jets. These engines, however, caused considerable vibrations which put a lot of pressure on the mostly wooden airframe. Despite numerous attempts to do so, these problems could not be solved, and yet another attempt was still in progress when he war ended in 1945.
During Me 262 development P.1070 was launched in an effort to reduce size (and thus price) of the aircraft by scaling down it's overall dimensions. When it became clear that production costs would be equally high to the 262, whose development was further along and thus closer to production, P.1070 was discontinued.
Like many contemporary projects, the P.1101 went through a number of sometimes radically different revisions. This represents the latest of those, which was submitted to the Luftwaffe in late February 1945. Though backed up by a successful prototype of an earlier variant, the main changes were aimed at minimizing the use of critical material, and thus the plane failed to garner much excitement in the RLM. Despite, or perhaps because of the minimum risk design it ended up having a greater impact on post-war developments than more ambitious concepts.
First proposed only in January 1945, this design was praised for it's clean aerodynamics and expected to have excellent flight performance, however the unprotected fuel tanks located in the wings were deemed a major vulnerability. Like the P.1110, the P.1111 provided much of the groundwork for the P.1112.
This concept represents an 'optimum solution' combining a lot of hard-won experience from recent project, mostly the P.1110 and P.1111. The result is a very modern looking aircraft and probably one of the most advanced development projects overall - until the Messerschmitt development labs were seized in late April 1945.
Though initially conceived as a parasite fighter, designer Heinz Sombold later altered the So 344 to a "bomber box buster". The rocket fighter was to be fitted with an ejectable nose section filled with explosives which was to be used as an "air mine", fired into the closely flying formations of Allied bombers. When all work on the Keiler was stopped in early 1945, only a scale model for aerodynamic tests had been constructed.