Specifically I want to make a collage of many pictures. For that purpose the software should be able to handle many large pictures, and align them relative to each other (snap center to center, etc)
I’d like to avoid having to do it in libre office if at all possible.
Is there anything like that?
I’ve used Silhouette Studio for this exact thing.
The basic edition is free, and has all the snap to alignments you’re looking for. The pro version ($100) lets you save as an SVG, PNG, or PDF, so printing what you make shouldn’t be an issue. It’s a lot more powerful piece of software than I expected it to be.
I would probably use Inkscape or Krita.
I made some posters in krita for work. Worked okay. Just make sure you start with the good ratio in px for printing.
Scribus is an excellent libre desktop publishing program.
I used to write a small postcard game for the “Wish you were here” jam, but it is suited to any job up to professional level.
If you plan on doing it on a regular basis, you might want to try latex. This is going to be hard on the first one or two poster but on the long run it can save a lot of time…
inkscape should work, and its all vector graphics, so you can do things like clip images