PDF Mergy is a free tool for combining PDFs. The service does not require you to register unless you want to select files from your Google Drive account. To merge files just select them from your desktop or your Google Drive account and PDF Mergy does the rest. When your merged files are ready you can download them. The video below shows you how the service works (the video does not have sound).
"Google Docs, which is now a part of Google Drive, now has more than 450 fonts available to all users. To access all of these new fonts select "add fonts" from the bottom of the font selection menu that you've always used. Selecting "add fonts" will open up a new menu in which you can mix and match fonts to your heart's content."
"We recently launched a new version of Google presentations with many new features to help you create beautiful presentations together. We've added the new editor to our Docs demos to make it easier to test drive your presentation building skills.
Check out the new animations and transitions, get artsy with drawings, and show off your masterpiece to a friend or colleague. You can share the link in the demo with others and work on the same presentation together. No login required. No Google account needed. Just go to docs.google.com/demo to take it for a spin."