Here are links we have found very helpful and informative.
Stained Glass Software (CAD)
Free Stained Glass Patterns
Glass Eye 2000 has designs of the month. These are archived, so they go back for years. A great thing about Dragonfly is that they offer a free trial version of their software including over 300 patterns. These may be resized, redesigned, etc. This trial offer is good for 30 days, but the patterns are yours forever.
Chantal's Stained Glass Here you will find free patterns along with patterns for sale. They are easily color-coded so you can tell the free ones. Free ones are in blue print. There are over a 100 free patterns.
The types of patterns include suncatchers, flowers, panels, lamp shades, boxes, clocks, candle holders, wreathes, mirrors, window corners, tissue boxes and photo frames.
These patterns range from easy to more difficult ones. The pattern's size is predetermined by the site, so, to alter the size, you will need to reduce it with a copy machine or Glass Eye 2000 software.
Spectrum Glass These patterns come in a 8.5 x 11-inch PDF file that can be downloaded and printed or digitally formatted which is compatible with the stained glass software, Glass Eye 2000. The patterns are arranged by sets. The only way to preview them is to click on a set. The pattern choices include 3d, holiday themed and panels.
Prostainedglass This site only offers free patterns. Their patterns include 3D projects, lampshades, borders and panels. There are approximately 150 patterns to choose from. They are sized to fit an 8.5 x 11-inch sheet of paper, which you can then resize if need be.
Paned Expressions Studios This site currently has 39 free patterns with new ones added monthly. The patterns can be resized when you print them.