Financial

Addsoft Corporation
Components for calculation of US state sales tax, Canadian GST and PST, credit card verification, and UPS freight charges.
http://www.addsoft.net/ECC/default.htm

Alpine Data
ActiveX controls for printing and manipulating tax-related forms.
http://www.formslib.com/activex.htm

AnTech
Components which implement financial functions (rsi, dmi, and adx). Financial and statistical functions implemented in an object-oriented way.
http://www.orchaid.com/francais/antech.htm

Caliber Technology
Tax tables and tax table software, withholding tax software. Software components and tax tables for computing payroll withholding.
http://taxupdate.com

CardCheck
Provides a way to validate credit card numbers. By Donia Software.
http://www.donia.com/products.htm#CardCheck

Euro Conversion Component
Currency conversion component to make applications Euro compliant. By AlphaSierraPapa.
http://www.alphasierrapapa.com/componentcenter/euro/

VCardCom
An Activex/COM component which validates a credit card number the user enters based on the rules of that card such as the value of first digit,the number of digits,as well as the checksum.
http://www.nehuenmultimedia.com.ar/html/vcardcom.html