Simlar

Simlar offers free, encrypted internet calls. Just pick a contact and call—it's that easy! Contacts using Simlar appear automatically, and you can invite friends, even iPhone users. It uses ZRTP encryption to keep calls tap-proof. Verify a short code on your first call for added security. Open-source and free, but requires a stable internet connection (1MB per 2 minutes). Learn more at simlar.org.