Ring4 - Manage business phone line as easily as you manage emails, in the cloud. Ring4 provide you with a business line and video conferencing solution.
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Burner - Disposable phone numbers -- now with MMS photo support
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
quackr - Protect your privacy & identity with quackr. Use our free temporary phone numbers to receive SMS online now.
Freephonenum - Freephonenum is a website that receives online SMS, use temporary and disposable numbers from USA and Canada to get verifications code from all around the world for development.