Some of these applications may be overkill. If you need to monitor sites for certain terms (for example, your personalized stock page for the word nosedive), check out Gotta Know Now ($15). All you have to do is enter URLs and search terms, then tell it to start looking. You can set audible alerts and have the program send an e-mail when it hits a search term. Returns are unfortunately plain text, not clickable links.

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