If you would like to have a drawing program that has a user interface like Thred, you should try aArtline.

aArtline has a unique symmetry feature that is perfect for creating geometric designs easily.  aArtline also exports Thred files.  Create objects in aArtline, and export them as Thred forms.  aArtline does not yet export text, though it does format text in a unique way by fitting it into irregularly shaped objects.

You can download the free aArtline drawing program at:

 http://www.aArtline.com.