Callweaver is a community driven software PBX project. The most important differences between Callweaver and Asterisk are built-in STUN support, the use of SpanDSP for better codecs and full T.38 fax over IP support, Sqlite instead of Berkeley DB, universal jitterbuffer, POSIX timers to avoid Zaptel timing dependencies, greater speed, more efficient dialplan execution, and greater stability.
CapiSuite is an ISDN telecommunication suite providing easy-to-use telecommunication functions which can be controlled from Python scripts. It uses a CAPI-compatible driver for accessing the ISDN-hardware, so you'll need a CAPI-compatible driver. CapiSuite is distributed with two example scripts for call incoming handling and fax sending. They provide a multi-user answering machine with fax recognition, remote inquiry, and fax receiving/sending functions.
The CommuniGate Pro Community Edition provides a single address and identity for all forms of Internet communications. You can check your e-mail, chat with colleagues via Instant Messaging and VoIP, view multiple calendars (and other presence features), maintain address books, and view streaming RSS news feeds, all through the powerful Flash-based interface.
This package contains generic Linux drivers for the Conexant HCF (controllerless) modem family used by many modem and computer system manufacturers. They should work on most current Linux distributions, based on the 2.4.x kernels. Some systems may require kernel recompilation with special ACPI patches.