I gave this a brief trial, and I have found that for commenting on related .edu blog posts, this free tool is great.
So your backlink campaign should consist of authoritative, trustworthy sites that sit in good neighborhoods such as .EDU blogs. Our tool will return results to relevant one-way .EDU blogs to leave comments that backlink to your your website. We highly recommend you leave meaningful comments on these blogs or a moderator may remove your comment thus wasting your efforts.
Use the search bar to find EDU Blogs to comment on and get valuable EDU backlinks Free EDU Blog Finder | How to Get EDU Backlinks