If you've been using a computer for a decade or more, you've probably settled into a set of default apps. At some point, you weighed your options, picked what seemed best, and never looked back. In the meantime, the software landscape has evolved quite a bit while you weren't looking. There's a decent chance you're paying for software—or putting up with limited free versions—while completely overlooking equally capable, if not more capable, open-source tools. Here are three such FOSS apps worth switching to.