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.
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.
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.