Found a free api list on github by DanNi0130 and davemachado, i decided to documented it, and added my own API data, to enrich collection. 

API is An application programming interface (API) is a set of routines, data structures, object classes and/or protocols provided by libraries and/or operating system services in order to support the building of applications.

Webservice is A Web service (also Web Service) is defined by the W3C as “a software system designed to support interoperable machine-to-machine interaction over a network”

Free Collection Go to this link.