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