If you have friends that have Internet connections, you can implement both of these services on a Raspberry Pi, old laptop, or similar. You may not be able to

If you have friends that have Internet connections, you can implement both of these services on a Raspberry Pi, old laptop, or similar. You may not be able to monitor the top 10,000 sites from a residential Internet connection, but you can monitor the 10 or 20 you really care about.