There are several software packages and tools out there from which you can make a research poster. The most commonly used program is Powerpoint, available as part of the Microsoft Office Suite of programs. You can also access Powerpoint online with a Microsoft account.
While intended as slideshow program, a Powerpoint slide can easily be resized to fit any print poster dimensions. A poster created in Powerpoint can also be saved as a pdf file, locking in the contents from outside editing, and allowing for easier printing on poster plotter printer.