Dvgt is a development of DVItoVDU, a very early previewer.

Dvgt has Terse, Box and Full preview modes. Terse mode uses the text mode of the VDU, and is insensitive to zoom. Box mode shows the bounding boxes of characters. Full mode gives a graphically rendered preview. On non-graphic terminals at low screen magnifications, Terse mode is the most useful, but as one zooms in, Box and Full modes become more and more accurate.

See also dvgtk.

The author is Geoffrey Tobin.