There are so many free SEO tools to keep tracking of your ranking.
– For Checking DA, PA and spam score you can use Moz.
– For checking Citation and Trust Flow, you can use Majestic.
– For keyword research the best tool is keywordtool.io
– For checking duplicate content issues, you can use Duplichecker
– For checking your competitor’s backlink use Ahref
– You can SEMrush for checking website related updates.
Yah some are not free, I know, but still, I have mentioned because these tools are useful in SEO. You can use any shared platform where you will get all the tools at a very low price.