I'm looking for some test library to create automa...

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I'm looking for some test library to create automated tests for a gui application (swing and opengl).
There are so many out there (https://sqa.stackexchange.com/questions/18554/open-source-tools-for-automation-of-java-gui-application-testing) and I'd like to have something modern, efficient and practical.
Can you suggest me something?