I have read an article for link building: doseoyourself dot com / step-5-build-solid-tier-1-links. It introduces some link building software like: Scrapbox, Ultimate Demon, Link Emperor& GSA SER. I have limited budget and I found GSA SER is the good one and would like to buy GSA SER. My question is: Can GSA SER do the same job as Scrapbox, Ultimate Demon and Link Emperor? Thanks in advance.