Antimatter15
Evil Meter
FreeDetect when a webapp uses User Agent detection.
Windowsdrag2up
FreeDrag files from Desktop onto any text field to upload and insert a link.
WindowsYouTube Repeat
FreeRepeat YouTube videos.
WindowsWave Unread Navigator
FreeGet alerted whenever there are in an open wave.
WindowsHide Elements
FreeHide elements using the context menu.
WindowsReadability API
FreeCreate sites that embed iframes with Readability.
Windows