Faxcore
FaxCore is 21st century network fax software: a high-performance engine designed to deliver fax traffic over enterprise netowrks of any size. FaxCore lets you fax enable the entire organization, seamlessly.

My Fax
Desktop and Mobile Fax lets you send, recieve and manage faxes using email and the web. It securely supports an unlimited number of users across your organization and is fully scalable.