PDF files have the option to let you share and comment on documents in a wide range of applications. Adobe Acrobat Reader and other free PDF programs offer a subset of the capabilities of the paid ...

PDF is the de facto standard for electronic document sharing or distribution. There are many PDF utilities to choose from when you want to create, edit, and view PDF documents, but here's a look at ...

The best free PDF reader apps do more than just act as a PDF viewer - any modern browser can do that. What I'm looking for is tools that go beyond that, offering commenting, collaboration, and ...