The Tcl Extension Archive is a repository of Tcl extensions hosted by ActiveState. Both pure-Tcl and compiled extensions are included, for Windows, *nix and MacOS X platforms. The URL of the archive is http://teapot.activestate.com/
Client- and server-side software are available. The TEAcup client is distributed with ActiveTcl. The TEApot server is distributed with the Tcl Dev Kit.