If you want to play with Jease without installing anything, you can use the live demo-server:
Start demo
Please note:

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The demo-server is restarted every hour with a default database, so if you're getting an error message, please wait a few seconds and reload.
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The file-upload is limited to 500KB.
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You cannot use Script- or Transit-Objects as demo-user due to security reasons.
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While jease.org runs on Tomcat, demo.jease.org is powered by Jetty. Both are fantastic lightweight application servers and both are recommended to be used with Jease.
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demo.jease.org uses a different template to demonstrate the clear separation between content and layout.