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URL: http://www.ieeetclt.org/issues/january2013/Alario.pdf -- Abstract: This paper discusses the lightweight integration of external applications in different learning environments like LMSs, PLEs or MOOCs using the GLUE! architecture. Also, the current status of GLUE! is presented, describing the particularities of integrating external applications in Moodle, LAMS and MediaWiki. Finally, the paper gives instructions to those interested in trying GLUE! or contributing to the integration of new applications or environments.