Civil Flag and Ensign 1935-1945 / Swastika Flag
National- und Handelsflagge / Hakenkreuzfahne

This flag is unchanged from [the] 1933 swastika flag and became the national and merchant flag, replacing the black-white-red tricolor. The same pattern was also used as jack, replacing the 1933 jack. This can be found in countless books, the best for exactness being Flaggenbuch 1939, plate II under Deutsches Reich, which contains exact proportions. As the merchant flag and jack, the white disk was placed somewhat closer to the hoist.

State Flag and Ensign 1935-1945
Reichsdienstflagge

N.B.: The swastika within the wreath is incorrectly reversed
A red flag with a centered white disk within which was [a] black circle and an upright black-white bordered black swastika reaching to the black circle. In the upper hoist a white Nazi Party type eagle (i.e. with outstretched wings). Illustrated in Flaggenbuch 1939, pl. II and Davis 1975, p. 81. Replaced the former Government Authorities Flag as well as the state and provincial flags, reflecting the change in government co-ordinating the states with the National government. On land, this flag was flown over non-military government facilities, e.g. post offices. At sea, it was flown as an ensign by government vessels that were not warships.

War Ensign 1935-1945
Reichskriegsflagge
 

Flag adopted 7th November 1935
The national ensign had a red field with a white-black-white bordered black cross with a center disk — thus clearly inspired by the Imperial Ensign. The center disk was somewhat larger and had a white-black bordered swastika instead of an eagle. In the canton there was a white-black-white bordered Iron Cross — instead of the Iron Cross on the black-white-red tricolor. This flag replaced the 1933 ensign. Illustrated in Flaggenbuch 1939, plate I and Davis 1975, p. 81.
Actual flags usually had on the border a small eagle with a circled swastika with an 'M' underneath (the mark of the Reichszeugmeister) and a size such as '200 × 335' stamped on it.
This scan shows the war ensign construction sheet as it appears in Flaggenbuch 1939.
Two different patterns of this flag existed: 
As the image in the Third Reich Factbook, but the bars of the center cross did not connect with the rings of the disc and border rings of the white disc was uninterrupted. 
(See image image in the Third Reich Factbook.) The white disc shifted slightly towards the seam. "The flag is recognized by the sections of the outer black ring of the center disc, which are connected with the outer black borders of the center cross, but interrupted by the white bars and the black center bar of the cross."
There were no two variants of this flag, [but two consecutive flags]. Tom Gregg's picture shows the first Reichskriegsflagge, introduced 7th November 1935. Marcus Wendel's picture [in the Third Reich Factbook] shows the later flag which replaced the first in February 1938.

Reserve Naval Officers' Civil Ensign 1935-1945
Merchant Flag with the Iron Cross / Handelsflagge mit dem Eisernen Kreuz

The Swastika flag with a white-black-white bordered black Iron Cross in the upper hoist. Illustrated in Flaggenbuch 1939, pl. III] Replaced the Naval Officers Flag of 1933.

Water Sports Flag
Wassersportflagge

 

The swastika flag with [a] white swastika disk half the height of the flag (instead of three-quarters as in the swastika flag). Behind the disk a white bordered black anchor. Illustrated in Flaggenbuch 1939, pl. III. I do not have a date on the adoption of this flag (clearly between 1933 and 1939, probably 1935 or later) or a description of the use.

Pilot Flag 1935-1945
Lotsenflagge

The Swastika Flag in a white border. In use 1935-1945. Replaced the old pilot flag. Continued the tradition of having the pilot flag be the merchant flag in a white border. Illustrated in Flaggenbuch 1939, pl. VIII.

Identification Sign for Weser Pilot Vessels
Erkennungszeichen der Weserlotsenfahrzeugen

Horizontally 8-striped red and white. In the hoist two vertical rows of 8 squares each, the first alternately red-white, the second alternately white-red. This flag is the traditional flag of the Free City of Bremen. I do not have a date on the adoption of this flag for this purpose, but it was certainly no earlier than 1935 when the use of the flag as a state flag of Bremen ceased. Illustrated in Flaggenbuch 1939, pl. VIII.

Postal Flag 1936-1945
Schiffspostflagge

Flag adopted 14 March 1936, abolished 1945
A white pennant with a narrow red border on the two outside edges, and with the black letters "DEUTSCHE POST". (...) It appears in Flaggenbuch 1939, pl. VIII.
It was adopted 14 March 1936 and abolished at the end of World War Two. Source: a paper by Emil Dreyer in the Reports of the 15th International Congress of Vexillology.