I have designed a low-tech computer for finding the scale for any key signature and any mode.  I spent some time searching the web for something similar but did not find anything.

A given key signature has scales in seven modes.  There are twelve different key signatures.  The 84 resulting scales are called the diatonic scales.

Here I describe how to make the computer.  AndieKae has followed the directions (and helped me write them).  She promises to post pictures of the steps in making hers.

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Tools:
* compass(for drawing circles)
* scissors
* protractor
* pencil and pen
* marker
* small nail
* sewing needle

The compass and protractor make things easier, but there are ways of doing without them.

Materials:
* stiff paper material (something like manila folders or a cereal box or even corrugated cardboard, preferably two different colors)
* two clothing buttons (say 1/4" to 3/4", the smaller the better, the kind with two or four holes)
* thread

Procedure:
1) From the stiff paper, make a disk of radius 3" and a disk of radius 2".  That way your computer will be 6" in diameter, but you can make it any size you like.  Preferably, use a different color for each disk.  Draw circles using the compass, and cut out the disks using the scissors.

2) Mark the twelve clock points lightly in pencil on the perimeters of each disk.  You can use the protractor for that, placing a clock point every 30 degrees.

3) On the larger disk, at each of the twelve clock points, write the names of a pitch of the chromatic scale, so that going clockwise around the disk represents an ascent of the chromatic scale.  The names must be placed so that they will not be covered up by the small disk when the disks are placed concentrically.  When using the computer, the larger disk will be held stationary, while the smaller disk will be rotated.  Therefore all the note names should be oriented the same way, so that they are all readable right-side-up at the same time, like the numbers on a clock face.

Some of the twelve pitches commonly go by more than one name.  Use the following names starting at twelve o'clock and moving clockwise: C, C#/Db, D, D#/Eb, E, E#/F, F#/Gb, G, G#/Ab, A, A#/Bb, B/Cb.  If you like, you can put some other note, say A, at 12:00 instead of C.  Notice that some of the pitches have rarely-used aliases,for example Cb as an alias for B.  You might want to write those aliases (namely E# and Cb) smaller so that they are less prominent.

4) On the perimeter of the smaller disk, use the marker to make prominent marks at 12, 2, 4, 5, 7, 9, and 11 O'clock positions.  Write the names of the modes at the hour positions as follows:

12: Ionian(Major)
2: Dorian
4: Phrygian
5: Lydian
7: Mixolydian
9: Aeolian(minor)
11: Locrian

5) Use the nail to make small holes in the centers of the disks.  Sew the buttons and the two disks together so that going from top to bottom there is 1) a button, 2) the smaller disk, 3) the larger disk, 4) a button.  The strands of thread should all pass neatly through the two holes in the disks so that the upper disk can be rotate easily.