No, all of these tools are paid. Free options are hard to find if you’re looking for something effective.
Metricool is free for one account, and you can use it if you don’t need LinkedIn.
It really depends on the price and UX for you. Hootsuite and Buffer are the most popular, but I’ve also heard good things about Planable!
I use Slack for communication and Meta Business Suite for all my clients running socials. It streamlines everything in one place. (Maybe I’m old school.)
I also use Meta Business Suite, and it’s so convenient for managing multiple accounts in one place. But sometimes I find it a bit frustrating when the features aren’t as flexible as I’d like.