Tropo is an API for the phone system. We make it easy for developers to add voice, SMS, and instant messaging to applications. You use familiar web programming with no special telephony knowledge required. Tropo is a product of Voxeo, a 10 year old pioneer in VoIP with 150,000 developers, including half of the Fortune 500.
Tropo's aim is to bring voice applications to smaller developers and startups, groups that are often put off by the costs and complexity of traditional VoIP development.
for information about Tropo. The logo has recently changed, and the site design is changing to match, so please don't use the site as a style guide.