Canva: An easy to understand website for creating a variety of documents. Make sure you create your document with inches not pixels. Save often. Download as a JPG.
PowerPoint: A popular, easy-to-use option. It is part of Microsoft Office package and is available on campus computers. (Advice for creating a poster with PowerPoint).
Publisher: A lot of the same elements as PowerPoint. Available on campus computers. Click here for sample template.
Open Source Alternatives: OpenOffice in the free alternative to MS Office (Impress is its PowerPoint alternative). Inkscape and Gimp are alternatives to Adobe products. For charts and diagrams try Gliffy or Lovely Charts. A complete list of free graphics software.
Pixabay: Website with free images to use in your poster. Download large images so they won't pixelate on your poster.
Kent State University has provided some great suggestions for presenting your poster, including video examples. Check them out here!
Some content on this guide adapted with permission from George Mason University Writing Center.
See more tips & sample posters at: http://www.ncsu.edu/project/posters/