nsmcrypt is an AOLserver module and standard Tcl library that implements an interface to the mcrypt library (libmcrypt). It supports cipher algorithms (such as blowfish, des, or rijndael-256), cipher modes (such as cbc, cfb, ncfb, or stream), and also supports sharing with nsv_* commands. It was tested with AOLserver 3.4.x and 4.0.x and Tcl 8.4.
nsmhash is an AOLserver module and Tcl package that implements an interface to the mhash library (libmhash). It supports hash, hmac, and key generation algorithms (such as SHA1, MD5, MCRYPT, and S2K_SALTED), and it also supports sharing with nsv_* commands. It was tested with AOLserver 3.4.x and 4.0.x and Tcl 8.4.
OpenIsis provides a library and tools to access CDS/ISIS databases, which are mostly used for bibliographic data (ISO2709, Z39.50) but also well suited for other catalogues due to the very flexible indexing mechanism. Based on a C library, there are also bindings for Perl and Java (Tcl to come).
Pixane is an image processing library for Tcl that allows the scripting of all kind of image transformations. It supports reading from and writing to a large set of file formats (JPEG, PNG, GIF, BMP, WBMP, etc) and provides anti-aliased text rendering and a set of built-in fonts. It doesn't requires Tk, so it can be used to easily generate images dynamically from CGI. Binaries are provided for many platforms as dynamic libraries with no external dependencies for easy deployment. It is also a core component of the eTcl distribution.
Poet (Prototype Object Extension for Tcl) is an OOP extension for Tcl/Tk featuring prototype-based inheritance, constraints, and persistence. It includes Poetics (Poet Integrated Construction Set), a set of tools for end-user inspection and modification of a running Poet application. The current Poetics tools are an object browser and a syntax-highlighting code editor. Poet is available wrapped as a starkit that can be used to load Poet into Tcl or standalone to demo and install Poet.
TCL2FTP is an extension library for Tcl scripts which allows Tcl programs to perform FTP client and gateway actions. It fully supports the FTP/FXP protocols, is ready for use with SSL/TLS, and is compatible with glFTPd. It can run simple FTP commands, and it supports 25 simultaneous FTP sessions.