Photos will be added over time.

Adler 7 (white)
Adler 8 (with separate typeset)
AEG #2 sn 276 (pre-production model)
Amata (Austrian) VERY RARE
Archo sn 913 (very low serial number)
Bambino
Bajnok (G&O)
Bing 1 (inkpad)
Bing 1 1/2 (ribbon)
Bing 2
Anfoe Student (white)(ring and glass keytops)
Bing 2 Student Type (ring and glass keytops and wooden baseboard)
Blick 5 (Solingen)
Blick 5 (Koeln)
Blick 6 (Koeln)
Blick 7 (Koeln)
Blick 8 (Koeln)
Cardinal sn 404 (earliest model known)
Carmen
Continental 1
Continental Silenta
Continental Wanderer 200
Courier (Oliver) (Austrian)
Culema 3
DEA 2
Diamant 1
Diktator (Victor 1) sn 1136
Gladstone (Edelmann)
Erica 1 sn 568
Erica 1 sn 3032
Bijou 1 sn 6463
Gloria 2 sn 7773
Excelsior 2 sn 50512
Faktotum #2
Famos
Victoria (Famos)
Fortuna Stolzenberg
Franconia # 924
AGC (Franconia # 672)(Hand decorated ONE-OF-A-KIND)
Fuerstenberg PROTOTYPE (Archo portable)
Germania 5
Glashutte
Frister and Rossmann 2 (Caligraph) sn 1702
Frister and Rossmann 4 (Caligraph) sn 3239
Ideal A2
Ideal 5 (early Ideal B) sn 187 (earliest model known)
Juwel 1
Kanzler 1b
Kanzler 3 wide carriage
Kappel #1 portable sn 18029 VERY EARLY MODEL
Lloyd (Stoewer 1b)
Lloyd Jr (Sun 2)
Lloyd IV (Imperial A)
Mercedes #8 (Pre-production model sn 37)
Merz 1 (nickled brass segment) sn 1134 (earliest model known)
Merz 1 (potmetal) sn 1788
Merz 2
Merz 3
Merz Universal
Merz Simplex
Meteor 1
Meteor 2
Meteor 3
Meteor 4 / Vasanta
Mignon 2 red
Mignon 4 (Olympia Plurotyp wide carriage)
Genia (French)
Tip-Tip (Czech)
Monica 1 sn 401 very low sn
Monica 2
Monica 3
Monica 4
Monofix
Minerva
Hacabo Prima (Minerva) sn 3410 (lowest sn known)
Moya Visible #3 (Berlin) Only 3 machines known to exist.
Neya #2
ODO NORMAL
Odoma
Odoma with tabulator
Orga Standard sn A121 (earliest model known)
Orga Standard sn 3435
Orga Privat (red)
Passat (rare)
Perkeo 1 (small model)
Perkeo 2 (large model)
Piccola (Corona)
Picht brailer
Polygraph #3 sn 1101
Postal 4 (Munchen)
Radio
Regina 3
Regina 4
Regina 7
Reliable
CAH/ Liga (Reliable)
Kontor (Reliable)
Belka (Reliable)
Hega Universal 5 (Reliable)
Remington 9 (qwertz)
Remington 10S (qwertz)
Senta 1 sn 5248 (Very early version)
Senta 3
Presto (Senta 2) sn 7428
Presto (new) sn 396
Protos
Siemag 1 sn 001374 (Very low sn)
Stoewer 3
Stoewer Record
Stoewer Elite
Stoewer Kleine
Stollwerke
Sun 4 (qwertz)
Tell (very rare predecessor to the Bar-Let portable) (Earliest known model)
Titania 2
Titania 3
Triumph portable (blue)
Urania 1 sn 2014 (VERY EARLY MODEL) sn start 1000
Urania Piccola sn 70223 (EXTREMELY EARLY MODEL) sn start 70000
Venus sn 660
Yost 15 (qwertz)

The two most complete collections of German machines in the world are located in Germany and owned by 1) Thomas Fuertig and 2) Tilman Elster (deceased). The Museum of Business History and Technology in Wilmington, Delaware has a smaller, but very nice German collection on display.
The Onondaga Historical Association in Syracuse, NY had a nice group of German machines, but they have been liquidated. Some are now listed above.
The Milwaukee Public Museum has about 50 German machines. None are on display.
Two other museum collections of German machines outside of Germany are in Partschins, Italy and Tilburg, Netherlands.