Site-Checker is a very simple ruby script I whipped up to check a long list of old links to see which ones are still active.
I got the list from an old repo I found on Google Code Archive. I will be using this script to to build a list of links for another repo I will be creating to save all of the interesting and useful Network and Cyber security resources that I come across.
Feel free to send me a pull request if you want to add anything.