Hvilken del av skype er det du ønsker alternativer til ?
Ekiga softphone eller hva det programmet heter er vel det som kommer nærmest til Skype tror jeg, men Empathy 2.32.0.1 støtter vel video/voice chat over SIP, XMPP og Google Talk, men støtter ikke oppringing.
Om Ekiga:
Ekiga (formely known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet.
It supports HD sound quality and video up to DVD size and quality.
It is interoperable with many other standard compliant softwares, hardwares and service providers as it uses both the major telephony standards (SIP and H.323).
http://ekiga.org/