The best replacement for twinkle is ekiga.

The best alternatives to twinkle are rated as following:
★★★★★  ekiga
★★  linphone
★★  planets
★  do planets twinkle
★  babykiss

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

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



Google Trends

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twinkle
ekiga
linphone