There are 2 repositories under polyglot-files topic.
Pack up to 3MB of data into a tweetable PNG polyglot file.
PDF/ZIP/NES polyglot file generator (PoC||GTFO 0x14-style)
Learn how to create HTML/ZIP/PNG polyglot files in JavaScript
Embed a ZIP or JAR file within a PNG image to create a tweetable and "executable" PNG-ZIP polyglot image file.
Embed and share your favourite AI image prompts within a tweetable JPG image file. Prompt is viewable as a basic web page.
Repository to house exotic non-trivial examples of shell scripts which are static polyglot files or morph into other files at run-time.
CLI tool to embed small files (e.g. "workflow.json") within a JPG image to create a tweetable JPG-ZIP polyglot file.