CAILogin is an image-based user verification program for Web page logins. It has no special dependencies, so it's suitable for embedded systems which lack "big" interpreted languages, such as PHP, Python, or Perl. It features a command line interface, which allows it to be very seamlessly integrated into shell scripts. It works by generating images of random numbers, on which it applies several obscuration filters. The end result is an image from which it is very difficult to extract the displayed number with current AI technologies.
Tcl Message Queues provides a Tcl interface to POSIX Message Queues. It exports, in the form of a Tcl package, the complete functionality provided by the underlying POSIX API, in a way familiar to Tcl programmers. Tcl-mq allows Tcl scripts to create, open, close, and unlink multiple parallel message queues, and to send/receive Tcl lists from and to them, in a synchronous and asynchronous manner. A POSIX message queue is an Inter-Process Communication mechanism available on Linux and some other POSIX-compliant operating systems.
Tcl PAM provides a Tcl interface to Pluggable Authentication Modules as implemented in Linux. It implements a Tcl package that exports the client-side functionality of PAM to the Tcl programming language. This allows Tcl scripts to use PAM for authentication. Pluggable authentication modules or PAM are a mechanism to integrate multiple low-level authentication schemes into a high-level application programming interface (API), which allows for programs that rely on authentication to be written independently of the underlying authentication scheme.
Tcl Syslog provides a Tcl interface to the standard *nix syslog service. It implements a Tcl package that exports the full functionality of the underlying syslog facility to the Tcl programming language. This includes local and remote logging. Syslog is a standard for forwarding log messages in an IP network. It is also used to refer to the implementation of this standard and API. It is typically used for computer system management and security auditing; usually to aggregate log messages in a central repository.