I often look up voice actors on MyAnimeList.net to see if they've voice any roles from shows I've seen.  It's kind of annoying to search through the list, though, so I made this little utility that edits a downloaded voice actor HTML page and filters out the shows you haven't seen.  It requires the user's MyAnimeList (myanimelist.net/animelist/meem0 -> Save as -> HTML only in the file type drop-down) HTML file downloaded in the same folder, called list.htm, and you run it by dragging the voice actor's HTML file onto the executable.  It then produces a filtered_{input filename}.htm, which you can view in your browser.  Handy!