This work presents an assessment and selection criteria for online teaching platforms for short-term, non-regular lessons. Online platforms for occasional use differ from those meant for regular, long-term courses in that an occasional use might not justify their purchase or installation in the teacher’s and the students’ devices, for example. The aim of this project was to find as many available platforms as possible, and to rank them in terms of criteria established by the University of Campinas’ academic community, which are their end users, and target audience of this project. A list of the ranked platforms, together with a flow chart to help teachers select the best available platform for their specific practice, as well as a description and tutorial of the top-ranked platform, was published at Unicamp’s website.