Google Maps

The Google Maps API supports the same browsers as the Google Local site. Since different applications require different behaviors for users with incompatible browsers, the Maps API provides a global method (GBrowserIsCompatible()) to check compatibility, but it does not have any automatic behavior when it detects an incompatible browser. The script http://maps.google.com/maps?file=api&v=2 can be parsed in almost every browser without errors, so you can safely include that script before checking for compatibility.

Read more at googleblog.blogspot.com...

Openomy PHP API

Openomy is an online file system. You can store files on Openomy and access them from any computer. Openomy organizes files and users via tags (as opposed to folders). You can choose to keep your files guarded by Openomy, or allow certain outside applications (of your choice) to do new and interesting things with your data.

Openomy PHP API