In this paper, the platform CALLISTO (CALmip Launches an Interface for a Semantic Toolbox Online, https://callisto. calmip. univ-toulouse. fr/) is presented, aiming at open science construction around semantic description of scientific data, software and papers. This work aims tackling the needs for a fine-grained description of multi-disciplinary scientific collaborations, from data creation to cross-fertilization. A framework for hosting comprehensive and semantic metadata for multi-disciplinary scientific teams is proposed. The platform provides a user-friendly online interface for data description, browsing and access. This research has been conducted in collaboration with the multi-disciplinary dataNooS academic alliance. CALLISTO is developed and maintained at the computing centre CALMIP.