Hi!

That's a really great idea! Definitely, free tools are a great inbound link acquisition strategy. In terms of thin content, I can easily overcome this by adding more context around the tools. You can write a nice introduction as to what the tool does and in what ways it may benefit the users; inclusion of FAQs or maybe a small tutorial will be able to do this. Even user reviews or case studies could do. That way, the page carries much more useful content while being centered on the tool itself. Hope that helps!