These are two backlinks indexing tools whose purposes are to try to make sure that my tier 1 backlinks are getting indexed by search engines. So, in effect, they are making some tier 2 backlinks.
A word of caution: I may be over-generalizing my results, but it might not be such a good idea to blast Google tools or properties with these indexers. I was trying to get an expired domain indexed by shortening the url with the goo.gl shortener, then tweeting the goo.gl link out on Twitter, and then submitting my Twitter profile page to freeseoindexer.com. The next day when I tested the shortened goo.gl url, I was informed by Google that it was deactivated because of improper use.
Free SEO Indexer will create new backlinks/301;302 redirect (Over 6000 domains) to your website and start pinging them to get them indexed. It works quite well with a high accuracy and can give you an easy
Our Free SEO Indexer can submit and ping your URL/Domain at the exact same time when you have submit to index. There are far more than 6000 domains where your site can be posted with our script all happening in a few minutes.
Despite the fact that these created links are only dynamic generally (they are not observable to someone browsing that page), you’ll still benefit from this submission sort since your webpage will be observable in all sort of log files and databases that get checked as well by search engines. Free SEO Indexer – Backlink Submitter
Seorobot.org Backlink Booster
will automatically add your link to 1,906 different websites. NOTE: this site only backlinks the root domain, not inner pages. So that means profile urls for example are not backlinked, therefore limiting the value of this site.
All you need to do is type your URL in the form above and click Build Backlinks. Our tool will handle the rest!
This backlink builder tool submits your URL to 1,906 different websites that automatically provide free backlinks for you. Each of these sites has been collected in one comprehensive list, and our free tool automates the entire process for you.
All of the websites in our list provide free website listings, site statistics, and site reports with dedicated URLs.
Backlink Booster processes the entire list, submits your URL to each website, and checks the status to make sure your site is listed. Backlink Booster
Masspings.com free backlink submitter
Here is a spare backlinks indexer site, for good measure, with different backlink domains: http://masspings.com/free-backlink-submitter