Ui Thumbnail Generator - A simple way to generate thumbnail. For docs and demos.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
FilePreviews - Thumbnails and metadata for almost any kind of file
The YouTube Thumbnail Game - Guess which YouTube video thumbnail has more views
Blog Cover - Cover image generator for your blog post
Videogram - Auto create interactive thumbnails (GIF card) of video