The best replacement for gizmo5 is sipgate.

The best alternatives to gizmo5 are rated as following:
★★★★★  sipgate
★★★★  skype

Your alternative for gizmo5 is not listed? Suggest!
Speaking about gizmo5, one probably shouldn't forget about ipkall.

Other search terms related to gizmo5 and their ratings are:
★★★★★ ipkall
You have in mind a companion for gizmo5 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gizmo5 in all years. Click on graph for more.
gizmo5
sipgate
skype