It's not "clickable," but see this thread for my system (a little out of date, but I'm too lazy to post my more recent updates).

Abbreviated version: if you use the "tr" command, you can get a list of words in any text file. Add a "uniq -c" pipe and you get a number indicating how often each word appears in the text file. As in:

tr 'A-Z' 'a-z' | tr -cs a-z '\012' | sort | uniq -c

(I "tag" each line in my big text file by using unusual prefixed (e.g., "kx"). So an entry on "folksonomy" could be tagged "kxfolksonomy." Once you do that, it's pretty easy to change the line above to pull up a list of just the tags.)

Again, it's not "clickable," but once you have the tag list, you can then easily pull up entries connected with any tag by using "grep."