The best replacement for gizmo is skype.

The best alternatives to gizmo are rated as following:
★★★★★  skype
★★  stripe
★  surveymonkey
★  sipgate
★  gremlins
★  furby
★  survey monkey
★  mini amp gizmo
★  ekiga
  gadget
  gizmo

Your alternative for gizmo is not listed? Suggest!
Speaking about gizmo, one probably shouldn't forget about google voice.

Other search terms related to gizmo and their ratings are:
★★★★★ google voice
★★ gremlins
You have in mind a companion for gizmo and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gizmo in all years. Click on graph for more.
gizmo
skype
stripe