May not be all, but some of the direct links to CB makers.
Barnett Crossbows:
www.barnettcrossbows.com
Excalibur Crossbows:
www.excaliburcrossbow.com
Great Lakes Crossbows:
www.dartonarchery.com/crossbows.htm
Horton Crossbows:
www.crossbow.com
Parker Crossbows:
www.parkerbows.com
PSE Crossbows:
www.pse-archery.com
Stryker Crossbows:
www.strykerxbow.com
Ten Point Crossbows:
www.tenpointcrossbows.com
Some of the Crossbows are made by Compound Bow manufactures. I did not post the Direct link to the CB sections since they can be changed over time with the different years coming out. So I just posted the main links to the sites. This is mainly for Parker and PSE.
Also, posted alphabetically.