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The proficiency of ontologies as the formal explication of knowledge in different domains has motivated numerous software engineers to develop miscellaneous ontology editors. The recent propensity of ontology engineering community, collaborative ontology development, necessitates exclusive ontology platforms supporting collaborative aspects. Although a few research have strived to look over the collaborative ontology editors, they have not determined a complete list of requirements and benchmarks for their investigations. Therefore, collaborative ontology development requirements have been proposed in this research comprehending collaborative methodologies and platforms. Regarding to these touchstones, two existing categories of collaborative ontology editors have been explored here. The most discussed and applied instances of these platforms, wiki-based and non-wiki-based, have been enumerated in this paper too. The itemization, description, and evaluation of platforms can be fruitful for the ontology-based applications in future. The results of this research (in the context of an ongoing EU project) demonstrate that workflow support, reliability of software, and integration/representation/storing of changes are the prominent gaps of current collaborative ontology development platforms. [ABSTRACT FROM AUTHOR]