We are extremley sorry if this article has misled you.
Except Yumpu, all of the plugins we have listed on this post have their lite versions available for free. While we wrote this article, Yumpu had its lite version as well, later on it was not working and we have mentioned it on the article as well.
Some of these plugin's lite version have 70k to 80k + active installation. That shows how much people are loving them. We have tried to list out possibly the best plugins.
And of course, these plugins have their premium versions available as well. And it is clearly mentioned in the article.
We have made an update after your feedback by clearly highlighting the link to the free version of these plugins.
Hope now it clears the confusions.
We are thankful for your feedback.