The suite
Tools
Relational · Full
designER
The complete tool for relational design: draw the ER model with automatic error detection, restructure it and generate SQL code.
Relational · Free
designER basic
The free version to draw ER models with no limits and no error checking.
NoSQL · Documents
noER
Design NoSQL document databases with a visual model, from the conceptual schema to the collections.
Relational algebra
designQT basic
Draw relational algebra expressions with a graphical editor (basic version).