The XSP library (one type of OSGi plugin that directly applies to XPages - DOTS is another instance of this type) can contribute any type of artifact that is defined in the XPages configuration file format (aka "xsp-config"). This wiki article is a good overview of creating these kinds of artifacts. I also recommend looking at the source code of the XSP Starter Kit project on OpenNTF, as it contains reference implementations of many different types of XSP artifacts, including several that are not listed in the wiki links above.
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