Atanua is a real-time logic simulator designed for educational use. It has an intuitive, OpenGL accelerated user interface, with which the user can place components and wires. It includes a wide range of simulated components to experiment with.
This software is not reviewed yet.
GalaXQL is an interactive SQL tutorial. Follow the instructions by your virtual teacher. The teacher can understand several possible mistakes that you may make, and gives hints on what may have gone wrong.