ReadingIQ - ReadingIQ is the most leading digital learning library app for kids ages 2 to 13.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
EduKittyABC - ABC Games for Kids – EduKittyABC is a fun tracing English alphabet educational app developed and published by Cubic Frog Apps.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
Bini Super ABC - Bini Super ABC! Alphabet Games for Toddlers and Kids is a fun education app for those kids who want to learn letters and sounds of the whole alphabets.
tSIP - tomeko.net/software: SIP client for Windows.