RelayFax Server 

RelayFax is a powerful email-to-fax and fax-to-email fax server. RelayFax Pro automates the process of sending, receiving and managing your network fax traffic. By integrating into existing email systems, RelayFax provides full faxing capabillities.
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CapiDog 

ISDN monitor program showing busy channels in system tray and pops up a window showing the calling, called and redirecting numbers when a call comes in. Also allows a d-channel trace into a file. Requires an AVM, Gerdes, or Scitel ISDN adapter.
isdn capi call monitor d-channel trace