Apache Open Office: http://www.openoffice.org/
Apache OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It works on all common computers. It can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose.
Google Drive: Create new documents, spreadsheets, and presentations on your own or share and collaborate with others in real time. All your changes are saved automatically in Drive.
Open and edit Microsoft® Office documents, spreadsheets, and presentations on your phone or tablet.
Jing --Share Ideas Instantly: http://www.techsmith.com/jing.html
Simple and free, Jing is the perfect way to enhance your fast-paced online conversations. Create images and videos of what you see on your computer screen, then share them instantly!
One-click screen capture recording on Windows or Mac computers with no install for FREE!
VideoPad Free Video Editor: http://www.nchsoftware.com/videopad/index.html
VideoPad is free video editing software for Windows.