MicroSIP

MicroSIP is a VoIP phone, something like a landline on your computer instead of Skype. After installation you need to configure MicroSIP, you can get information about configuration from your SIP operator (e.g. odorik.cz). These operators usually provide cheap international calls or SMS as well as bargain calls to local networks. MicroSIP includes an address book, a list of recent calls, multiple SIP accounts can be used, and the settings are rich.