SkySentials - SMS, call transfer and more
Single Skype instance ensures not to open multiple instances
Skype Call Recorder
Skype-action-handler for Skype 1.4 for Linux
Kontact integration
Callto: Skype links for phone numbers with Ubuntu and FireFox
Hotkeys to Answer or Hangup Skype
Musicmood - Amarok music title in your Skype mood
Gstfakevideo - A Skype video hijacker to turn a user-defined gstreamer pipeline into a video source
Skype History converter to make it readable, accessable and indexable
Skype Extras listing
Official Skype extras listing:
https://extras.skype.com/categories/19/good
If you want your Extra added here please ping me on Skype.