IBM WebSphere Portal is a set of software tools that enables companies to build and manage web portals.
The WebSphere Portal package is a component of WebSphere software, developed and marketed by IBM.
The WebSphere Portal software suite adheres to industry standards; the Java Portlet Definition Standard (both JSR 168/v1 and JSR 286/v2 specifications) defined by the Java Community Process, as well as the Web Services for Remote Portlets (both WSRP 1.0 and 2.0) specifications defined by the Web Services for Remote Portlets OASIS Technical Committee.
Source: Wikipedia