majesticseo, mozscape, seo spyglass, scrapebox

You missed out Ahrefs.

Personally, I find Ahrefs better than the rest because you get more data on your backlinks.

My vote for Ahrefs, best backlink analyze.

Backlinks Checker Tool - Backlink Watch

If you want to free software then the Backlinkwatch and the ahref or ranksignals.com is the best one ..

I prefer backlinkwatck, smallseotools, and ahref for competitor back link watch.

Well, there are bulk of tools available that you can use to spy on your competitors what I mostly use is the WebMeUp or Majestic SEO.

backlink watch and rank signals are better

Majestic Seo, but I am just really used to it, and its always improving itself, so idk Love it!

[DELETED]