X-Lite, Zoiper, CSipSimple, tSIP, Google Voice and Video Chat, Paltalk, Yate - Yet Another Telephony Engine, PhonerLite, Linphone, Acrobits Softphone, YateClient, YakYak, DrayTek SIP SoftPhone, Starfish PBX, Telephone, Ekiga, Sipnetic, Chat Rooms, We-Talk, Voip Stunt, SessionTalk SIP Softphone, Vodia Networks, Q-municate, Callcentric are some alternatives to MicroSIP.