Forum Nokia provides additional information for developers designing applications for S60 devices, including downloads, documentation, wikis, eLearning, and discussion boards.
C++ Developer's Libraries - Information packages for developers wishing to use the S60 platform to develop mobile C++ applications and services. The libraries include a C++ API Reference Guide. They also provide links to the Symbian OS online library, and to documentation and example applications available on Forum Nokia. Note that a separate library is available for S60 3rd Edition SDK for Symbian OS, Feature Pack 2.
Java Documentation page - Libraries, additional documentation, and examples.
Web Developer's Library - Information package for developers wishing to create widgets for S60 devices. The library includes introductory, getting started, implementation, and API-level information.