plainas

This is a very barebones plugin, it aims to do one thing well and nothing else. There are no fancy extra features. Just insert [postslideshow] on your post content where you want the slideshow to appear and you’re good to go. All the pictures of the current post will be included in the slideshow.
The dimensions of the gallery can be configured in options menu.

Post Slideshow Gallery

A simple plugin that displays post's pictures on a slideshow. Use the shortcode [postslideshow] to insert galleries on your posts.

kennethrapp

WordPress Galleria provides a simple way to collect image attachments into a <a href="//galleria.io" rel="nofollow ugc">galleria.io</a> image gallery. This plugin uses the Classic theme.

WordPress Galleria

Wordpress Galleria provides a simple way to collect image attachments into a galleria.io image gallery. This plugin uses the Classic theme.

Post Slideshow Gallery vs WordPress Galleria