The primary site for the Tcl and Tk distributions is given below as a Universal Resource Location (URL):
You can use FTP and log in to the host (e.g., ftp.scriptics.com) under the anonymous user name. Give your e-mail address as the password. The directory is in the URL after the host name (e.g., /pub/tcl). There are many sites that mirror this distribution. The mirror sites provide an archive site for contributed Tcl commands, Tk widgets, and applications. There is also a set of Frequently Asked Questions files. These are some of the sites that maintain Tcl archives
You can use a World Wide Web browser like Mosaic, Netscape, Internet Explorer, or Lynx to access these sites. Enter the URL as specified above, and you are presented with a directory listing of that location. From there you can change directories and fetch files.
If you do not have direct FTP access, you can use an e-mail server for FTP. Send e-mail to firstname.lastname@example.org with the message Help to get directions. If you are on BITNET, send e-mail to email@example.com.
You can search for FTP sites that have Tcl by using the Archie service that indexes the contents of anonymous FTP servers. Information about using Archie can be obtained by sending mail to firstname.lastname@example.org that contains the message Help.