Zoiper is #2 in Top 10 SIP Softphones
Zoiper, the free softphone to make VoIP calls through your PBX or favorite SIP provider. Available for iPhone, Android, WP8, windows, mac and linux.
Positions in ratings
#2 in Top 10 SIP Softphones
The best alternatives to Zoiper are: Bria, Linphone, MicroSIP, 3CX Phone, Groundwire