HylaFAX APIs

gnu.hylafax - The gnu.hylafax package is a pure-Java implementation of the HylaFAX client protocol. The gnu.hylafax package can be used to implement a HylaFAX client that will run on any Java-supporting system. See http://www.net-foundry.com/java/gnu/hylafax/.
HylaFSP - Normally used as a Windows HylaFAX client, a HylaFSP fax device is also a Windows Fax Service Provider for HylaFAX. Developers can use the Windows Fax Services API to connect to a HylaFAX server. See http://www.ifax.com/content/view/48/79/ for a VB Script example of controlling HylaFSP. See MSDN for documention on the Fax Services API. Available from iFAX Solutions
TFrogFax: Delphi Component to build your Hylafax Client Applications