BVoIP - BVoIP allows to easily add Cloud & On-Premise VoIP PBX to the product offering without having to re-invent the wheel or add another layer to the daily operations..

XO Hosted PBX - Hosted PBX is a scalable UC solution that uses cloud technology to integrate HD voice & data services, mobility, along with advanced calling

Windstream Holdings - Windstream Holdings is a scalable cloud-based business phone solution that provides complete and unified communication applications to businesses of all sizes.

Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems

Cebod Telecom - Cebod Telecom is a flexible, cost-effective VoIP business phone service solution used by various businesses and industries such as real estate, healthcare, tax office and marketing etc.

Sipdroid - Free and open-source SIP/VoIP Client