I've prepared some instructions how to deal with prepared Tcl Plugin. Please download .nbm file from http://plugins.netbeans.org/plugin/39119/tcl-plugin . Make sure that your Netbeans plugins are up to date. Sometimes Netbeans couldn't handle automatic update during installation of Tcl Plugin. I also recommend to manually install missing plugins.
First step: Open Netbeans 7.0. Select Tools→Plugins:
Plugins window will open. Select Downloaded tab and press Add plugins... button:
Select just downloaded .nbm file:
You will see this information:
Now select Install button. Here is the result:
Installer will ask you to confirm BSD License and display warning about my certificate:
After all steps Tcl Plugin is installed:
Current state of Tcl Plugin allows to edit .tcl files with syntax highlight and create Tcl Projects.
File→New Project gives ability to create empty Tcl script:
It looks like this:
Available options: