If you're looking for presentations, you can try Xmind. It's not opensource, but it's available on Linux and it's got something called "presentation mode" which is absolutely amazing.
Penpot, inkscape, gimp, krita. You get no preset templates but they all do the same thing as canva. If you're not looking for something opensource then you can try postermywall.
Is Canada like a weapon x program site? Or do they think they can get away with it cuz people are polite there? Every company tries stupid shit in Canada first.
If you're looking for presentations, you can try Xmind. It's not opensource, but it's available on Linux and it's got something called "presentation mode" which is absolutely amazing.