Brand new: Apache LGPL license
Esper is a very interesting project about temporal querying on events. I hope to use it soon in a project. But beyond that, they invented the Apache LGPL license:
“Esper was designed to make it easier to build CEP and ESP applications. Esper is open-source software available under the Apache LPGL license.”
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This was actually a typo error, Esper 1.0 is LGPL.