Yes! Most of the JST plugin catalog have free trials available, you can click the Free Trial button on the product page and checkout as a free order. You will receive the downloads shortly after via Sendowl.
Please note that NO CODE is required for free trials, only an iLok account and you will need to have the iLok license manager software installed on your computer.
Free trials are valid for 14 days from the date you activate the trial license, not the date of checkout at the store.
For more info on iLok, please see here - https://joeysturgistones.com/pages/ilok-instructions
Not all JST plugins have free trials available at this stage.