The keggrest Python library was created for use with Kegg, the Kyoto gene and genome encyclopedia, API. The library provides a basic front-end for the database. Keggrest, authored by Enrico Giampieri, is OSI approved and has a BSD license.
The Illumina Basepace API is a key stepping stone to simplifying genomics software development by third parties with a platform as a service. The API allows you to build for any platform, web, desktop, or "Native apps." Illumina offers whole-genome sequencing, individual genome sequencing, and with Basespace offers processing, storage and apps sold by third party vendors.
EquipmentWatch has built a name for itself in the heavy equipment industry through its Web app that provides a single window into heavy equipment data. The company is now opening the API that currently powers the Web app to the developer community for integration with third party systems.