Zotera "is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources." It does require a download, and this may be restrictive on school networks.
Recover Hard drive software by Recovery Mechanic allows to undelete files, repair damaged corrupted and inaccessible disks partitions, recover deleted files and lost folders, undelete lost and corrupted email databases. http://recoverymechanic.com/
PDFCreator - The free PDF Converter Tool Create PDF files from within any Windows program Create PDFs from any program that is able to print Send generated files via eMail
Apple's PowerPoint equivalent is one of those marvels of software design, allowing you to easily and powerfully create compelling presentations on a device that fits in your pocket.