Info about writing javascript media providers can be found in the providers directory.

JW6 Flash providers are supported in JW Player 7, but is considered partner restricted. We supply limited support for providers developed in Flash. Use the jw6-flash-provider-sdk readme and source examples on your own.

JW6 plugins are supported in JW Player 7 for legacy purposes. If you need JavaScript or Flash loaded into the player based on player setup config, jw6-plugin-sdk may be for you.

The JW Player 6 XML format for skins has been deprecated and is no longer used in JW Player 7. The jw6-skin-sdk is kept here for users with legacy players.

JW Player 7's UI is always rendered in html and can be customized with CSS. More info can be found here.