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Nitro PDF, the California-based company behind Nitro PDF Professional, has now added the logical counterpart to its well-regarded $99.99 (£69) Acrobat alternative: a free PDF reader called Nitro PDF Reader.
Like its Professional sibling, Nitro PDF Reader has an Office 2007 look about it, employing a ribbon interface (which you can hide if need be) to deliver an impressive set of features for a free application. Note that Nitro PDF Reader supports multiple PDFs in tabs.
Nitro PDF Reader is only available for Windows systems and is currently in beta. You can download it from Nitro's product-specific website (22.6MB for the 32-bit version, 25.3MB for the 64-bit version).
You get a good set of annotation and collaboration tools in Nitro PDF Reader, including sticky notes, text highlighting, underlining and crossing out, or direct typing onto the page.
You can also sign PDF forms by stamping them with a captured signature, cutting out the need to print, sign and re-scan the document. Multiple password-protected signatures are also supported.