Centering images within a topic and a slider for images

This theme-component adds composer buttons to center images Image Alignment and Grid. There is also Image Annotator - Allows you to annotate images in the previewer which adds the allignment buttons to the preview.

Did you take a look at the theme-component category? With the help of search it is quite easy to find those, which do someting with images. Maybe Slick Image Gallery is what you are looking for.