As I think that this website should not be tied in to just one simulator, this page contains several simple circuits for simulation on Qspice.
As always simulation will not show all aspects of the performance of the real circuit. There will be circuit parasitics which are not included in these simulations.
Firstly download and install Qspice from www.qorvo.com
You may find that Qspice looks and behaves a bit like LTspice.
As several browsers seem to think that the Qspice .qsch circuits are a jpeg you can download these Qspice circuits as a ZIP file here
Or if you really wish to click on the names below to open the circuits, try right clicking and doing save as, if your browser has changed the file extn from .qsch to .jpg, you will have to change it back again. then run Qspice and tell it to open the file.
After a few circuits you may be able to ignore the directions written on the cct diagrams, as Qspice is reasonably simple to operate.