GOG.com was nice enough to sort out games that are free or discounted price regardless of genre.
I think it's about time IndieDB should do that too. Right now I am having a hard time which past and present IndieDB games are free or not despite a very huge list (and it continues to grow in size), even in TBA status. I hope this option to sort out free or paid cost needs to be mentioned soon.
Not just IndieDB, so do SlideDB and VRDB as well.