This paper describes a study of alternatives to support teaching activities in virtual learning environments. Through a systematic review, we sought to identify plug-ins and papers that discuss or provide optimization solutions to teacher's tasks in Moodle. Altogether, 489 plug-ins and 346 papers of the event Moodle Moot were analyzed. The results demonstrate effort to assist teachers by researchers and developers, but indicate an underutilization of the potential offered by intelligent systems and a decentralization of the solutions presented with the original system.