GNS3 version 2.1 beta 1 has been released. Major new features of 2.1 include packet filters (packet loss, latency, jitter etc.) for links, node duplication and appliance templates can be installed from within the application.

Please see https://goo.gl/jf41z7 for a detailed overview.

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This video discusses these features:
(1) Appliance templates are available from within the application

You can search appliance templates from within the application. A dialog wizard will ask you for required images the first time you install an appliance.

(2) Display errors and notifications in an overlay

Errors will be displayed in a floating popup. This allows you to close the GNS3 console without missing errors and notifications.