Dulcimer scales or modes (those common in traditional music) with melody string(s) tuned open to D 
Dulcimer with one extra fret
Appropriate drone string notes must be chosen
  0 1 2 3 4 5 6 6.5 7 8 9 10 11 12
All Notes D E F# G A B C C# D E F# G A B
D Major (Ionian) D E F# G A B   C# D          
G Major (Ionian)       G A B C   D E F# G    
E Dorian   E F# G A B   C# D E        
A Dorian         A B C   D E F# G A  
D Mixolydian D E F# G A B C   D          
A Mixolydian         A B   C# D E F# G A  
E Aeolian (Natural Minor)   E F# G A B C   D E        
B Aeolian (Natural Minor)           B   C# D E F# G A B
Possible Tunings For Scales With Starting Fret & Capo Position
These tunings never go more than one whole step above DADD Tuning (When melody string is A, tune down to A). With these tunings the drone strings are always the one and five of the root chord. Bold-italicized print tunings include strings tuned higher than DADD, with increased risk of string breakage depending upon string gauge.
Scale or Mode Tuning Root Fret Capo
A Dorian EAED 4     0  
A Dorian DADD 0     4  
A Dorian DGDD 3     1  
A Dorian DADA 7     4  
A Major EAEA 0     0  
A Major EAEE 3     0  
A Major CFCE 1     2  
A Major DGDG 2     1  
A Minor EAEC 5     0  
A Minor DGDG 0     1  
A Mixolydian EAED 4     0  
A Mixolydian DGDD 3     1  
B Minor DADD 0     5  
B Minor DGDD 5     2  
C Major DGDG 0     3  
C Major DGDC 7     3  
D Dorian DADC 1     0  
D Major DADD 0     0  
D Major DADA 3     0  
D Minor DADC 1     0  
D Mixolydian DADD 0     0  
E Dorian EBED 1     0  
E Dorian DADD 0     1  
E Major DADB 2     1  
E Minor EBED 1     0  
E Minor DADD 0     1  
G Dorian DADC 1     3  
G Major DGDD 3     0  
G Major DADD 0     3  
G Major DGDG 0     0  
G Mixolydian DGDC 4     0