Links to most common sensor software and drivers:
Apteryx: http://www.apteryx.com/apteryx-updates-site
Carestream: http://www.carestreamdental.com/us/en/support/Software%20Updates#TWAIN%20Drivers
Dexis: http://www.dexis.com/download-dexview
Gendex: http://www.gendex.com/software-drivers
Schick: http://www.schickbysirona.com/items.php?catid=596
Open Dental: http://www.opendental.com
Suni: http://www.suni.com/usa/support/intraoral_imaging.aspx