TemaTres is an open source vocabulary server, web application to manage and exploit vocabularies, thesauri, taxonomies and formal representations of knowledge. TemaTres can support distributed management models, ensuring consistency and integrity of data and relationships between terms. It has features specially designed to provide data traceability and quality control in the context of a controlled vocabulary. TemaTres supports the analysis and categorisation of terms for search. It enables vocabularies to be represented in a wide range of metadata standards relevant to knowledge management. TemaTres provides a web services interface which allows controlled vocabularies to be integrated into other management platforms, or to be used to develop downstream services.