OK, I am going to cheat here. This is actually 3 tools in one. The first one is PDF. Any PDF file is a great tool. You can make a PDF file from almost any other file, an MS Word file, a web page. IT is portable, you can add pictures, links, even embed videos in them. Think of it like a container.
The best way to make a pdf is with Adobe Acrobat. The full version, not the free reader. But that costs about $100. Even if you are a teacher. There are lots of conversion software websites out there, they can make pdfs for you. But I like to use Google Docs, because it can download files you make in many different formats, one of them pdfs.
One PDF I have discovered is David Duebel’s Video Handbook. It is 50 pages of hands-on tips for using video for language teaching. David is a consultant for English Central, so the last few pages are a little focused on that website, but the quality and quantity of good information can’t be beat. Click on the link just above this picture to download the PDF of the handbook.
I like the Best Practices (page 5), and although we can argue about some of the assertions on page 6, such as “Captions: High frequency viewing of subtitled video leads to large improvement in fluency (Koostra and Beentjes, 1999, 56-8)”, there are a lot of useful tips with supporting research, again made available through links, because he used PDFs.
But my favorite link in the handbook is on page 11. It is an embedded video (this is tool #3), by one of my favorite video producers, Radio Lab. Get their podcast. But they also do videos. Get your pen and paper ready. Vocabulary quiz. How many words can you find?