LinkNabber.com

I don't find LinkNabber nor their services useful or anything similar in that respect. They're an outdated company, I think nobody uses their services anymore (since ~2013, maybe), and I also think there are better alternatives (a few dozen, at least). From the moment I entered their website, they looked to me like a company with a very low reputation.

Their service of link building or whatever it is they offer is indeed free of charge, but that's where all the fun ends, actually. Their services are not even reliable, and I don't even know whether any of their tools even help. I recommend avoiding LinkNabber, but I wish they were still alive as a company, because I would love to see functional free service like the one they used to have in offer.

All in all, avoiding them is strongly recommended. Sure, you can embed their piece of code into your own website, but ask yourself and see - will it work? I honestly think not. Therefore, whatever they planned to do with this type of service has indeed plummeted, because nobody even knows about these guys. You can find quite a number of better (and alive) companies with ease!