It's not the fastest, and you do have to make sure they're not blocking the content you want to read. Inks is a great free PDF reader that has some neat features. It even has an extension for Microsoft (IE9!) if you have to open PDFs that don't support Open XML (you know, MS Word). It should have a Mac version if anyone wants help converting .pdf to .ions. They need to get the UI for the extension down. There are lots of them, I found all the ones I needed (not all of their extensions work on Google Chrome.) Godzilla is another one of the older freeware, but it's an open-source project and seems to be updated frequently. It supports a lot of PDF formats (including the HTML5 one) and it comes with some great features. I don't use it often, but I think I might be using it more than any of the others. You can find it at: Some other interesting resources. There's a bunch of stuff that I don't remember the exact name for. It's not very user-friendly, though. There is also a free version (at least some of them are), which is called PDF zine. I have no idea how it stacks up in terms of features or ease of use. That's it for now.