Message Bus is a cloud-native application service for email and mobile messaging. The selling point is the high deliverability rate, its ability to scale according to demand and the fact that it's simple enough to be used by developers with limited time and resources. The Message Bus API makes it possible for developers to easily add messaging functionality to their websites and apps.
The National Institue of Standards and Technology (NIST), has created created AppVet. AppVet is an open-source tool that IT groups can use to test applications for use on government networks. AppVet was designed to easily integrate with third party apps and tools (e.g. antivirus software, analyzers, vulnerability repositories, etc.) through simple APIs.
Our API directory now includes 50 backend APIs. The newest is the CloudBees API. The most popular, in terms of mashups, is the CloudMine API. We list two CloudMine mashups. Below you'll find some more stats from the directory, including the entire list of backend APIs.