Glogster is an excellent tool for creating digital posters.
The following link is to a library of educational posters which have been created by Glogster users:
Glogpedia - Library of Educational Digital Posters
Note: Glogster used to be a free app but now there is a monthly charge for users.
The following link is to a library of educational posters which have been created by Glogster users:
Glogpedia - Library of Educational Digital Posters
Note: Glogster used to be a free app but now there is a monthly charge for users.