f you have Google Chrome installed on your PC, it can actually do this. Google Chrome includes both an integrated PDF viewer and print-to-PDF features. Drag-and-drop a PDF file into the Chrome browser window to open it in Chrome. Click the menu button in Chrome and select Print. Click the "Change" button under Destination and choose Save as PDF.
a visual timer for Windows. Free download, gradually reveals an image. free images and sounds
You can probably download to a usb stick and then install on unmanaged computers. I have not tried to make it appear under a student or teacher log in
onscreen keyboard with built in word prediciton, access to dictionaries. can download during evaluation period and then it appears to be aroune $30. works on PC, TAble PC