Open Source PhonerLite Alternatives
PhonerLite is described as 'enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP). You need an internet connection and an account from a provider supporting the SIP protocol'. There are more than 10 alternatives to PhonerLite for various platforms. The best alternative is Linphone, which is both free and Open Source. Other great apps like PhonerLite are MicroSIP (Free, Open Source), CSipSimple (Free, Open Source) and Telephone (Freemium, Open Source).