Description: Protégé is an open-source ontology editor and knowledge-base framework. It provides tools to construct domain models and knowledge-based applications with ontologies. Protégé implements a rich set of knowledge-modeling structures and actions that support the creation, visualization, and manipulation of ontologies in various representation formats.
Type: software
Pricing: Open Source
Description: SQL Developer Data Modeler is a free graphical tool that helps developers design complex relational databases. It provides a visual interface to model entities and relationships, generate DDL scripts, and reverse-engineer from existing databases.
Type: software