fonmon is a remote phone monitor for isdn4linux. It includes a server application for your ISDN-enabled computer (e.g. an ISDN gateway) and a client for your workstations (Linux and even Windows). You can easily monitor all incoming calls through your network with various clients, with features like highlighting, logging, and number/name exchange. The server won't run on a machine without an ISDN card in it.
GSMLIB is a library to access GSM mobile phones through GSM modems. Features include: modification of phonebooks stored in the mobile phone or on the SIM card, reading and writing of SMS messages stored in the mobile phone, sending and reception of SMS messages. Additionally, some simple command line programs are provided to use these features.
Voxpak is a GUI for playing, editing, renaming, etc. voice and fax messages. It includes scripts for popping up sticky-notes or requesters with caller ID info, renaming voice messages to date+callerid, using Python and pyGTK. A small Kaptain script is also available as an alternative.
SMSLink implements a client/server gateway to the SMS protocol (short messages on the mobile phones). It requires the use of dedicated hardware (a serial GSM module). Both SMS emission and reception are supported, either in text-mode or in PDU-mode. It also includes an SMS to eMail gateway module. The server runs under Linux and FreeBSD and supports interactive mode via telnet. The command-line client already exists for Linux, FreeBSD, Solaris, HP-UX, and Win32. A basic Web interface is also provided.