Flickr - image and video hosting website
PTE AV Studio - Create photo and video slideshows with effects and styles.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
ProShow - ProShow is a dedicated tool for creating slide shows from your photos, video and music.
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
Imagination - Imagination is a lightweight and simple DVD slide show maker for GNU/Linux.