wpcocktail

The Site Title Caption Modifier is a simple WordPress plugin that sets the caption of all images in your WordPress site to the site title. This is particularly useful for maintaining a consistent branding or style across all posts and pages. The plugin works by hooking into the WordPress ‘img_caption_shortcode’ filter and modifying the caption output.

Image Caption for WP

Automatically sets the caption of all images to your site's title.

webdevstudios

Michael Beckwith

Justin Sternberg

pluginize

Jetpack has a pretty robust Image slideshow feature. (If you don’t know, “Add Media” button > “Create Gallery” > Choose photos > “Create new gallery” > Change type to slideshow in “Gallery Settings” > “Insert Gallery”)
Make sure you have “Compose using shortcodes to embed media from popular sites” enabled in “Settings” > “Writing” > Composing section of Jetpack settings.
Jetpack’s handling of photo’s captions doesn’t work well with long captions (as it overlays the caption above the photo). This plugin modifies the layout so that the caption is displayed below the photo and the slideshow expands to accommodate.
Contribute on <a href="https://github.com/tw2113/Jetpack-Slideshow-Caption" rel="nofollow ugc">github</a>.
Slideshow Captions for Jetpack is not maintained by Automattic.

Slideshow Captions for Jetpack

Modifies Jetpack's default slideshow caption feature.

Image Caption for WP vs Slideshow Captions for Jetpack