Glass Cutters
Regular non-lubricated glass cutters require adding oil to the glass surface while you work, which requires some practice to keep from making a mess. They do allow for making scores in tight spots. Pricing runs from $6 to about $35 for cutters for particular types of glass.
There also small table model glass cutters that allow you to put the glass into the cutter mechanism, set the cutter and then push your glass through the glass cutter. These are excellent for production work, long pieces and for folks who have a hard time bending over the cutting area.