Collanos Phone is a software-only Voice over Internet Protocol (VoIP) phone and a multi-protocol instant messenger supporting Jabber, MSN, ICQ, AOL, and Yahoo! protocol combined in one application. It is available on Windows, Mac OSX, and Linux.

Pros: Collanos is an easy to use voice-over-internet telephony software that boosts the entire computing experience by providing free of cost internet to phone calls. The interface is much similar to IM applications; only difference is its solid desktop-applications like frame. As you sign in Contacts, History and Dialpad tabs self-explain the functionality of Collanos. When adding contacts there are separate fields for landline and cellphone numbers of the buddies, their Collano, Yahoo!, Jabber, ICQ and AOL ids. User can sign in into all of the 5 protocols during a single session and corresponding online buddy lists appear on the screen for each protocol ID. Each selected contact has options for chatting, offline texts, SMS and most pleasing option to dial their mobile or landline numbers. Like all other IMs, Collano has an option for 3-way chat and voice conferencing. History functionality stores the entire record of events like dialed numbers, sent SMSes and chat logs. Chat option provides full-fledged messenger like utility and displays time when chatting, allows exchanging smileys and incoming chat alerts. Collanos is compatible with Windows, Mac OSX, and Linux. Collanos uses Session Initiation Protocol (SIP) standard, the worldwide default standard for VoIP solutions whereas instant messenger part is based on the popular Extensible Messaging and Presence Protocol (XMPP) standard that is used by most popular IMs.

Cons: No negative issues.

Overall: A rare freeware combining various IM protocols along with VoIP. It can considerably cut down communication costs. Rated at 5 stars.