McCAD PCB-ST Lite is the scholastic edition of the McCAD Pro Series. This FREE download is capable of doing small projects.
Additional support tools are available separately from the developer's site which can be added to simplify the design process.
This FREE download version is fully functional for small projects. PCB-ST Lite project limits are controlled by the memory allocations available to the editing buffers. For the PCB-ST Lite series this means up to about 150 pins depending upon the design complexity.
You can move to the PCB-ST SE500 Educational version (available separately) should you decide that you need more capability. In the PCB-ST SE500 you can tackle designs up to the size of the original Apple I Replica computer.