Integrity  is a very convenient, easy to use HTML link checker for MacOS. It’s “donationware” and has helped me make sure I don’t have any broken links in my work website , my personal website , and my course website . And currently, it’s working on this blog.
Everything  is a fast NTFS file name search program for Windows. Here’s a review . It’s not quite Spotlight for MacOS, because it doesn’t search file contents, it only scans file names, but it is very fast.