We describe ViCoS, a tool for constructing and visualising conceptual spaces in the area of language documentation. ViCoS allows users to enrich existing lexical information about the words of a language with conceptual knowledge. Their work towards language-based, informal ontology building must be supported by easy-to-use workflows and supporting software, which we will demonstrate. 1 Research background and application context Language documentation aims at the creation of a representative and long lasting, multipurpose record of natural languages. Such documentation contributes to maintain, consolidate or revitalize endangered languages, and inherently, also contributes to the description of cultural elements of a language community [1]. Our aim is to increase this cultural aspect by allowing users to complement linguistic information -- defined mainly by lexica and annotated media recordings -- with ontological information. Our approach in centered around the notion of knowledge s...